The Collaborative International Dictionary of English v.0.48:
Miss \Miss\ (m[i^]s), n.; pl. Misses (m[i^]s"s[e^]z). [Contr.
1. A title of courtesy prefixed to the name of a girl or a
woman who has not been married. See Mistress, 5.
Note: There is diversity of usage in the application of this
title to two or more persons of the same name. We may
write either the Miss Browns or the Misses Brown.
2. A young unmarried woman or a girl; as, she is a miss of
Gay vanity, with smiles and kisses,
Was busy 'mongst the maids and misses. --Cawthorn.
3. A kept mistress. See Mistress, 4. [Obs.] --Evelyn.
4. (Card Playing) In the game of three-card loo, an extra
hand, dealt on the table, which may be substituted for the
hand dealt to a player.