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Best Definition Apps

202+ iOS apps curated and reviewed

4.3 avg rating
19 free apps
Updated June 2026

Every iPhone needs a few good definition apps. We benchmark 202+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Definition Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Dictionary.com: English WordsDictionary.com: English WordsFree4.8★ (328K)YesNoJul 2026
2Merriam-Webster DictionaryMerriam-Webster DictionaryFree4.8★ (320K)YesYesJul 2026
3Vocabulary - Learn words dailyVocabulary - Learn words dailyFree4.8★ (209K)YesYesJul 2026
4Barre DefinitionBarre DefinitionFree4.9★ (2.7K)NoYesJul 2026
5Oxford Dictionary & ThesaurusOxford Dictionary & ThesaurusFree4.6★ (28K)YesYesJul 2026
6Dictionary.Dictionary.Free4.8★ (14K)YesYesJul 2026
7Word of the Day・VocabularyWord of the Day・VocabularyFree4.7★ (38K)YesYesJul 2026
8WordPal - Vocabulary BuilderWordPal - Vocabulary BuilderFree4.7★ (9.1K)YesYesJul 2026

Top Picks for Definition

Dictionary.com: English Words#1

Dictionary.com: English Words by Curiosity Media

Dictionary, Thesaurus, Vocab
Editor's Choice
🔍 Reference
4.8😐(328K ratings)
FreeAdsIn-App Purchases
Dictionary.com: English Words screenshot 1
Dictionary.com: English Words screenshot 2
Dictionary.com: English Words screenshot 3
Dictionary.com: English Words screenshot 4
Dictionary.com: English Words screenshot 5

Access over 2 million trusted definitions and synonyms for English words. Enhance your vocabulary with daily new words, example sentences, and audio pronunciations. This app provides grammar tips and editorial content to deepen your understanding of the English language.

What We Love

  • 🚀 Robust dictionary and thesaurus
  • 🤓 Helpful resources like blogs and articles
  • 💡 Useful word games and puzzles
  • 👍 Easy to use and navigate

Room to Improve

  • 🐛 Inconsistent search results and missing definitions
  • 💸 Aggressive ads even after paid upgrades
  • 🤯 Frequent crashes and performance issues
Merriam-Webster Dictionary#2

Merriam-Webster Dictionary by Merriam-Webster, Inc.

Strong Contender
🔍 Reference
4.8😊(320K ratings)
FreeAdsIn-App Purchases
#42in Reference
Merriam-Webster Dictionary screenshot 1
Merriam-Webster Dictionary screenshot 2
Merriam-Webster Dictionary screenshot 3
Merriam-Webster Dictionary screenshot 4

Access America's most respected dictionary, updated with new words and meanings. This app offers offline access, voice search, daily vocabulary challenges, and a thesaurus. It's designed for English language reference, education, and vocabulary enhancement.

What We Love

  • 🚀 Easy to use
  • 👍 Comprehensive definitions
  • 👍 Helpful thesaurus
  • 🚀 Offline access

Room to Improve

  • 🐛 Ads can be intrusive
  • 🐛 Difficulty closing ads
  • 🐛 Repetitive game questions
Vocabulary - Learn words daily#3

Vocabulary - Learn words daily by Monkey Taps

Word of the day widget & games
Worth Considering
📚 Education
4.8😊(209K ratings)
FreeAdsIn-App Purchases
#10in Education
Vocabulary - Learn words daily screenshot 1
Vocabulary - Learn words daily screenshot 2
Vocabulary - Learn words daily screenshot 3
Vocabulary - Learn words daily screenshot 4
Vocabulary - Learn words daily screenshot 5
Vocabulary - Learn words daily screenshot 6

Expand your vocabulary with daily word learning and engaging games. This app offers customizable learning paths and difficulty levels to suit your English proficiency. Make vocabulary acquisition a fun and effective part of your routine.

What We Love

  • 👍 Beautiful app design
  • 🔊 Pronunciation feature
  • 📚 Wide range of vocabulary
  • 🔖 Ability to bookmark words

Room to Improve

  • 🐛 Pronunciation issues and mismatched IPA
  • 🔍 Limited search functionality
  • 🔢 Too many words per day

More Definition apps to explore

4
Barre Definition
Barre Definition
Barre Definition
Pilates, Barre, Cardio & More
Free

Access a variety of fitness classes including Pilates, Barre, and Cardio workouts. Follow monthly plans or choose specific programs designed for muscle definition, weight loss, and flexibility. Workouts range from 10-45 minutes and can be done offline.

Monthly fitness plansFollow-along workoutsMuscle definition focus
💪 Health & Fitness
(2.7K)
subscription
5
Oxford Dictionary & Thesaurus
Oxford Dictionary & Thesaurus
Oxford Dictionary & Thesaurus
Thesaurus & Offline Vocabulary
Free

Access a vast collection of dictionaries and thesauruses with definitions, pronunciations, and etymology. Features include offline access, advanced search options, and personalized word lists. Ideal for students, professionals, and word enthusiasts.

15 Oxford DictionariesThesaurus integrationAudio pronunciations
🔍 Reference
(28K)
free with in-app purchases
6
Dictionary.
Dictionary.
Dictionary.
by TheFreeDictionary.com
Free

Access a comprehensive dictionary, thesaurus, and translation tool with millions of definitions and synonyms. Explore specialty dictionaries, learn new words daily, and play word games. This app offers offline access and integrates seamlessly with other applications.

Offline dictionary and thesaurusMillions of definitions and synonymsWord of the Day and Idiom of the Day
🔍 Reference
(14K)
free with in-app purchases
7
Word of the Day・Vocabulary
Word of the Day・Vocabulary
Word of the Day・Vocabulary
Vocab Builder & Word Games
Free

Enhance your vocabulary with daily words, engaging games, and personalized quizzes. This app offers expert-curated content and interactive challenges to make learning stick and improve your communication skills.

Daily word insights with definitions and examplesVocabulary assessment and personalized learning plansWord games like Hangman and Gaps
📚 Education
(38K)
free with in-app purchases
8
WordPal - Vocabulary Builder
WordPal - Vocabulary Builder
WordPal - Vocabulary Builder
Learn English words daily
Free

Enhance your English vocabulary with this intuitive app. It uses spaced repetition to help you learn new words effectively, offering definitions, examples, and progress tracking. Achieve your language learning goals with daily reminders and streaks.

Spaced repetition learning algorithmMultiple choice synonym practiceWord definitions and examples
📚 Education
(9.1K)
freemium
9
Terminology
Terminology
Terminology
Dictionary•Thesaurus•Research
Free

Explore the English language with this comprehensive tool. It offers dictionary and thesaurus functions, along with research capabilities to dive deeper into words and phrases. Extend its functionality with custom resources for web and app searches.

Offline U.S. English dictionarySynonyms, antonyms, and word relationsCustomizable resources for web and app searches
🔍 Reference
(1K)
freemium
10
English Dictionary *
English Dictionary *
English Dictionary *
Thesaurus and Vocabulary words
Free

Enhance your English vocabulary with a comprehensive offline dictionary and thesaurus. Access over 500,000 words, their meanings, synonyms, antonyms, and pronunciations. Perfect for students and professionals to improve language skills anytime, anywhere.

Offline word searchSynonyms and antonymsWord definitions
🔍 Reference
(1.1K)
subscription
11
Power Thesaurus
Power Thesaurus
Power Thesaurus
Comprehensive. Fast. Reliable.
Free

Find accurate synonyms, antonyms, definitions, and related words with this comprehensive and fast thesaurus. Designed for writers, students, and professionals, it offers intuitive navigation and smart filters to help you express ideas clearly and confidently.

Ad-free PRO MembershipIntuitive navigationSmart filters
🔍 Reference
(2.9K)
freemium
12
Mot du jour — Daily French app
Mot du jour — Daily French app
Mot du jour — Daily French app
Daily French words every day
Free

Expand your French vocabulary daily with interesting words chosen by language professionals. Impress others with your enhanced speech and keep your brain sharp. Offers a premium ad-free experience with multiple subscription options.

Learn one new French word dailyCurated words by language professionalsEnhance vocabulary and speech
🔍 Reference
(754)
freemium
13
Dictionary & Translator
Dictionary & Translator
Dictionary & Translator
Learn and Translate Languages
Free

Access trusted definitions, thesaurus, and pronunciations for numerous languages. Translate text and images offline or online, and enhance your learning with vocabulary challenges and grammar checking.

Offline dictionary and thesaurusCross-cultural text and image translationVocabulary challenges and grammar checking
📚 Education
(13K)
free with in-app purchases
14
Computer Networking Dictionary - Terms Definitions
Computer Networking Dictionary - Terms Definitions
Computer Networking Dictionary - Terms Definitions
by Santosh Mishra
Free

Instantly decode computer networking terms with this free offline dictionary. Features a vast encyclopedia, search, bookmarking, sharing, and audio pronunciation. Perfect for understanding technical jargon in conversations and your career.

Extensive encyclopedia of networking termsSearch functionality for quick lookupsBookmark terms for easy retrieval
📚 Education
(5)
free
15
The Ultimate Buzzer Pro
The Ultimate Buzzer Pro
The Ultimate Buzzer Pro
80+ Sounds for Pranks & Games
$1.99

Transform your device into a versatile noise machine with a vast collection of sound effects. Perfect for pranks, games, or adding a dramatic flair to any situation. Enjoy a distraction-free experience with exclusive sounds and no advertisements.

Over 60 high-quality sound effectsBig Button Mode for full-screen interactionIntegrated flashlight utility
🎬 Entertainment
(1.1K)
free with in-app purchases
16
Geology Dictionary Terms Definitions
Geology Dictionary Terms Definitions
Geology Dictionary Terms Definitions
by Santosh Mishra
Free

Instantly decode geology terms with this free offline dictionary. Access a vast encyclopedia of geological vocabulary, bookmark important terms, and learn correct pronunciation with audio. Perfect for students and professionals encountering unfamiliar geological language.

Extensive geology term encyclopediaOffline accessSearch functionality
📚 Education
(7)
free
17
Etymonline English Dictionary
Etymonline English Dictionary
Etymonline English Dictionary
Dictionary to Build Vocabulary
Free

Explore the origins and history of English words with this comprehensive dictionary app. It offers instant search, related word suggestions, and an offline mode for premium users. Enhance your vocabulary and understanding of word roots.

Word origin explorationInstant search with suggestionsRelated words by root
📚 Education
(11K)
free with in-app purchases
18
True Definition Pilates
True Definition Pilates
True Definition Pilates
by Definition Mind Body LLC
Free
💪 Health & Fitness
(0)
19
Petroleum Dictionary Terms Definitions
Petroleum Dictionary Terms Definitions
Petroleum Dictionary Terms Definitions
by Santosh Mishra
Free

Instantly decode petroleum terms with this free offline dictionary. Perfect for students and professionals, it offers a vast encyclopedia of jargon with search, bookmarking, and audio pronunciation features.

Huge encyclopedia of petroleum termsSearch functionalityBookmark terms
📚 Education
(5)
free
20
Definition Fitness
Definition Fitness
Definition Fitness
by Definition Fitness PTY LTD
Free
💪 Health & Fitness
(0)

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FAQ about Definition

What are the best definition apps for iPhone?
Dictionary.com: English Words tops our definition apps ranking as of June 2026, with a 4.8-star average from 328K App Store ratings, and it's free to download.
Yes — 19 of the top definition apps we rank are free to download, including Dictionary.com: English Words and Merriam-Webster Dictionary.
Dictionary.com: English Words shows ads and has no in-app purchases, according to its App Store listing as of June 2026.
We track 202+ definition apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.
This app serves as a comprehensive English dictionary and thesaurus, offering over 2 million trusted definitions and synonyms. It aims to help users improve their English vocabulary, understanding, and writing skills through various features.
Key features include access to millions of definitions and synonyms, a 'Word of the Day' to expand vocabulary, example sentences to show word usage, audio pronunciations, grammar tips, and a search history to track learned words.

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