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

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, …

“Us.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/us. Accessed 7 Jan. 2026.

Merriam-Webster is the most reliable, trusted, easy-to-use dictionary and thesaurus online. Our products also include bilingual dictionaries and the Official Scrabble Dictionary.

Sep 2, 2025 · 45 Letters The longest word entered in most standard English dictionaries is Pneumonoultramicroscopicsilicovolcanoconiosis with 45 letters. Our definition is "a lung disease …

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Noah Webster's famous dictionary, published in 1828, shaped what we now consider American spelling. But ultimately, the choice of which spellings to adopt is made in the most democratic way possible: …

The meaning of DEFINITION is a statement of the meaning of a word or word group or a sign or symbol. How to use definition in a sentence.

“United States.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/United%20States. Accessed 5 Jan. 2026.

The meaning of RACISM is a belief that race is a fundamental determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race. How to use …