is a form of expression which we allow in familiar conversation (written or spoken), but which we disallow in formal and dignified conversation. Colloquialisms
consist mainly in using inexact and abbreviated forms.
For example, we frequently use the word "nice." It is a "nice" day is inexact, but the expression is so widely colloquial as to make it permissible in informal
Such abbreviations as ad
, are colloquial. You should guard against allowing your form of expression to become too colloquial; otherwise readers may justly accuse you of "laziness in writing." Moreover, colloquialism is a sibling to slang.