Definition of colloquial
1a
: used in or characteristic of familiar and informal conversation
In colloquial English, "kind of" is often used for "somewhat" or "rather."
also
: unacceptably informal
b
: using conversational style
a colloquial writer
2
: of or relating to conversation : conversational
colloquial expressions
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Merriam-Webster unabridged
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Time Traveler for colloquial
The first known use of colloquial was in 1751
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