the sign (,), a mark of punctuation used for indicating a division in a sentence, as in setting off a word, phrase, or clause, esp. when such a division is accompanied by a slight pause or is to be noted in order to give order to the sequential elements of the sentence. It is also used to separate items in a list, to mark off thousands in numerals, to separate types or levels of information in bibliographic and other data, and, in Europe, as a decimal point.
2.
Classical Prosody.
a.
a fragment or smaller section of a colon.
b.
the part of dactylic hexameter beginning or ending with the caesura.
c.
the caesura itself.
3.
Music. the minute, virtually unheard difference in pitch between two enharmonic tones, as G♯ and A♭.
4.
any of several nymphalid butterflies, as Polygonia comma, having a comma-shaped silver mark on the underside of each hind wing.
[Origin: 1520–30; < LL: mark of punctuation, L: division of a phrase < Gk kómma piece cut off (referring to the phrase so marked), equiv. to kop- (base of kóptein to strike, chop) + -ma n. suffix denoting result of action (with assimilation of p)]
1586, "short phrase," from L. comma, from Gk. komma "clause in a sentence," lit. "piece which is cut off," from koptein "to cut off," from PIE base *(s)kep- "to cut, split." Like colon, period, a Gk. rhetorical term for part of a sentence which has been transferred to the punctuation mark that identifies it. Used as such in Eng. as a L. word from 1530; nativized by 1599.
A punctuation mark (,) used to indicate pauses and to separate elements within a sentence. “The forest abounds with oak, elm, and beech trees”; “The bassoon player was born in Roanoke, Virginia, on December 29, 1957.”
commacharacter "," ASCII character 44. Common names: ITU-T: comma. Rare: ITU-T: cedilla; INTERCAL: tail. In the C programming language, "," is an operator which evaluates its first argument (which presumably has side-effects) and then returns the value of its second argument. This is useful in "for" statements and macros. (1995-03-10)
Ca"pon\, n. [OE. capon, chapoun, AS. cap?n (cf. F. chapon), L. capo, fr. Gr. ? akin to ? to cut, OSlav. skopiti to casrate. CF. Comma.] A castrated cock, esp. when fattened; a male chicken gelded to improve his flesh for the table. --Shak. The merry thought of a capon. --W. Irving.