1 In classical rhetoric, dependent subunit of larger units of meaning consisting of approximately two to six syllables. ( also colon) 2 Punctuation ‹,› mark for indicating syntactic ordering, such as separating introductory clauses from the...

A comma ( , ) is a punctuation mark. It has the same shape as an apostrophe or single closing quotation mark in many typefaces, but it differs from them in being placed on the baseline of the text. Some typefaces render it as a small line,...