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2. colloquium-an address to an academic meeting or seminar. speech, address-the act of delivering a formal spoken communication to an audience; he listened to an address on minor Roman poets. noun.
Freebase(0.00 / 0 votes)Rate this definition: Colloquialism. A colloquialism is a word, phrase or paralanguage that is employed in conversational or informal language but not in formal speech or formal writing. Dictionaries often display colloquial words and phrases with the abbreviation colloq. as an identifier.