Comma

1. n. A small interval (the difference between a major and minor half step), seldom used except by tuners.
2. n. A character or point [,] marking the smallest divisions of a sentence, written or printed.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.