Definitions from Wiktionary ( )

▸ noun:  (typography) The punctuation mark ⟨,⟩ used to indicate a set of parts of a sentence or between elements of a list.
▸ noun:  (Romanian typography) A similar-looking subscript diacritical mark.
▸ noun:  (entomology) Any of various nymphalid butterflies of the genus Polygonia, having a comma-shaped white mark on the underwings, especially Polygonia c-album and Polygonia c-aureum of North Africa, Europe, and Asia.
▸ noun:  (music) A difference in the calculation of nearly identical intervals by different ways.
▸ noun:  (genetics) A delimiting marker between items in a genetic sequence.
▸ noun:  (rhetoric) In Ancient Greek rhetoric, a short clause, something less than a colon, originally denoted by comma marks. In antiquity it was defined as a combination of words having no more than eight syllables in all. It was later applied to longer phrases, e.g. the Johannine comma.
▸ noun:  (figurative) A brief interval.
▸ verb:  (rare, transitive) To place a comma or commas within text; to follow, precede, or surround a portion of text with commas.

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