noun
a word used to identify any of a class of people, places, or things
preposition
a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause
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Her command of language was evident in her eloquent speech at the conference.
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She's got a great command of language, always finding the right words to say.
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Dude, his command of language is off the charts!
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The author's command of language painted a vivid picture in the reader's mind.