Definition of "men's"

men's

/mɛnz/

noun
1. possessive case of men: belonging to some or all male humans.
2. Ellipsis of men’s room: a lavatory intended for use by men.
  Quotations
  A gents' toilet room might be found in a house that caters for the cheaper class of theatrical patronage, where the slangy language of the "goin' to the mat this aft?" style prevails. A gents toilet room is not found in the Southern Hotel. It either "men's" or "gentlemen's".
  1898, The Hotel/Motor Hotel Monthly, volume 6, page 27
3. Ellipsis of men's department: an area selling clothing for adult males in a department store.