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  1. Find Definitions & Meanings of Words | Britannica Dictionary

    19 hours ago · Clear and simple definitions in American English from Britannica's language experts. More usage examples than any other dictionary.

  2. Medical Dictionary - Merriam-Webster

    Search the most up-to-date and comprehensive medical dictionary from the reference experts at Merriam-Webster. Master today's medical vocabulary. Authoritative pronunciations.

  3. ONLINE DICTIONARY Definition & Meaning | Dictionary.com

    ONLINE DICTIONARY definition: a dictionary that is available on the internet.

  4. Definition.org | Best Online Dictionary and Reference Site

    Definition.org is a leading online dictionary for word definitions, synonyms, translations, pronunciation, and word of the day. Find the most accurate definition for your word search in our easy-to-use …

  5. Oxford Advanced American Dictionary at Oxford Learner's ...

    Quickly find clear definitions and audio pronunciations of words.

  6. Derivatives: definition and basic rules | Khan Academy

    The derivative of a function describes the function's instantaneous rate of change at a certain point. Another common interpretation is that the derivative gives us the slope of the line tangent to the …

  7. DEFINITION | Pronunciation in English - Cambridge Dictionary

    Listen to the audio pronunciation in English. Learn more.