Which resource provides definitions for a large number of words in a language?

Dictionaries are comprehensive resources that provide definitions for a vast number of words in a language. They typically include not only the meanings of words but also information about their pronunciation, usage, and grammatical features. This makes dictionaries invaluable for anyone looking to understand the nuances of language or clarify the meaning of specific terms. They serve as the primary reference for word definitions, showcasing how words function within various contexts and offering etymological information.

In contrast, an encyclopedia focuses on providing summaries of knowledge across various subjects and is not dedicated to individual word meanings. A thesaurus primarily lists synonyms and antonyms, helping users find words that have similar or opposite meanings, but it does not provide detailed definitions. A grammar guide offers information on the rules governing the structure and use of a language, rather than focusing on word definitions specifically. Therefore, the role of dictionaries is distinct and essential for anyone seeking to deepen their understanding of vocabulary.