characteristic of or appropriate to ordinary or familiar conversation rather than formal speech or writing; informal.
involving or using conversation.

1745–55; colloquy + -al1

colloquially, adverb
colloquialness, colloquiality, noun
quasi-colloquial, adjective
quasi-colloquially, adverb
semicolloquial, adjective
semicolloquially, adverb
uncolloquial, adjective
uncolloquially, adverb

1, 2. Colloquial, conversational, informal refer to types of speech or to usages not on a formal level. Colloquial is often mistakenly used with a connotation of disapproval, as if it meant “vulgar” or “bad” or “incorrect” usage, whereas it is merely a familiar style used in speaking and writing. Conversational refers to a style used in the oral exchange of ideas, opinions, etc.: an easy conversational style. Informal means without formality, without strict attention to set forms, unceremonious: an informal manner of speaking; it describes the ordinary, everyday language of cultivated speakers.

1. formal. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To colloquial
World English Dictionary
colloquial (kəˈləʊkwɪəl)
1.  of or relating to conversation
2.  Compare informal denoting or characterized by informal or conversational idiom or vocabulary

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  colloquial
Part of Speech:  adj
Definition:  pertaining to words or expressions more suitable for speech than writing; in informal, conversational style
Etymology:  Latin colloquium 'speaking together'
Main Entry:  colloquial
Part of Speech:  n
Definition:  colloquial language or speech
Etymology:  Latin colloquium 'speaking together''s 21st Century Lexicon
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Word Origin & History

1751, from colloquy "a conversation" (1459), from L. colloquium "conference, conversation," from com- "together" + loqui "speak."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Common names are also provided for standardized formats, when the formal name
  excludes colloquial elements.
Perhaps my more colloquial understanding of random is different from the
  mathematical meaning.
Flutter sounds colloquial and innocuous, but it can be deadly.
Yet he was plain and colloquial in speech, not full of profound pronunciamentos
  about life.
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