Find definitions for over 300,000 words from the most authoritative English dictionary. Continuously updated with new words and meanings.

Webster's Dictionary is any of the US English language dictionaries edited in the early 19th century by Noah Webster (1758–1843), a US lexicographer, as well as numerous related or unrelated dictionaries that have adopted the Webster's name in his honor.

The meaning of DICTIONARY is a reference source in print or electronic form containing words usually alphabetically arranged along with information about their forms, pronunciations, functions, etymologies, meanings, and syntactic and idiomatic uses. How to use dictionary in a sentence.

Search an online dictionary written specifically for young students. Kid-friendly meanings from the reference experts at Merriam-Webster help students build and master vocabulary.

Get America’s most useful and respected dictionary, optimized for your iPhone, iPad, and Apple Watch. Continuously updated with the newest words and meanings, this is the premier iOS app for English language reference, education, and vocabulary building. And …

The world’s leading online dictionary: English definitions, synonyms, word origins, example sentences, word games, and more. A trusted authority for 25+ years!

Get unlimited access to one of the world's largest, most comprehensive dictionary. Merriam-Webster Unabridged is designed for today’s librarians, writers, editors, students, and professionals alike with the most up-to-date definitions, information, and other exciting features.

The classic dictionary and America’s most-trusted authority on language. More than 75,000 definitions, including updates to reflect current usage. Includes pronunciations, word origins, synonym lists, and over 8,000 usage examples to aid understanding.

Some online dictionaries are organized as lists of words, similar to a glossary, while others offer search features, reverse lookups, and additional language tools and content such as verb conjugations, grammar references, and discussion forums.

A revised and updated edition of the best-selling dictionary covering core vocabulary with over a hundred new entries and senses. More than 75,000 definitions and 8,000 usage examples aid understanding―and cover the words you need today.