The Collaborative International Dictionary of English v.0.48:

Comma \Com"ma\, n. [L. comma part of a sentence, comma, Gr. ?
   clause, fr. ? to cut off. Cf. Capon.]
   1. A character or point [,] marking the smallest divisions of
      a sentence, written or printed.
      [1913 Webster]

   2. (Mus.) A small interval (the difference between a major
      and minor half step), seldom used except by tuners.
      [1913 Webster]

   Comma bacillus (Physiol.), a variety of bacillus shaped
      like a comma, found in the intestines of patients
      suffering from cholera. It is considered by some as having
      a special relation to the disease; -- called also cholera
      bacillus.

   Comma butterfly (Zool.), an American butterfly (Grapta
      comma), having a white comma-shaped marking on the under
      side of the wings.
      [1913 Webster]

WordNet (r) 3.0 (2006):

comma
    n 1: a punctuation mark (,) used to indicate the separation of
         elements within the grammatical structure of a sentence
    2: anglewing butterfly with a comma-shaped mark on the underside
       of each hind wing [syn: comma, comma butterfly,
       Polygonia comma]

The Free On-line Dictionary of Computing (19 January 2023):

Comma

    COMputable MAthematics.

   An ESPRIT project at KU Nijmegen.

   (1994-11-30)


The Free On-line Dictionary of Computing (19 January 2023):

comma
,

    "," 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)