Definition of colloquial adjective from the Oxford Advanced Learner's Dictionary

 

colloquial

 adjective
adjective
BrE BrE//ˈləʊkwiəl//
 
; NAmE NAmE//ˈloʊkwiəl//
 
 
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(of words and language) used in conversation but not in formal speech or writing synonym informal Word Origin mid 18th cent.: from Latin colloquium ‘conversation’ + -al.
See the Oxford Advanced American Dictionary entry: colloquial