basement

English Wikipedia has articles on:

basement and basement (geology)

Wikipedia Wikipedia

From base +‎ -ment.

• IPA^(key): /ˈbeɪsmənt/

• Audio (US):

  (file)

• Rhymes: -eɪsmənt
• Hyphenation: base‧ment

basement (plural basements)

1. A floor of a building below ground level.
   • 1914 November, Louis Joseph Vance, “An Outsider […]”, in Munsey’s Magazine, volume LIII, number II, New York, N.Y.: The Frank A[ndrew] Munsey Company, […], published 1915, →OCLC, chapter III (Accessory After the Fact), page 382, column 1:

     Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.

3. (geology) A mass of igneous or metamorphic rock forming the foundation over which a platform of sedimentary rocks is laid.
4. (sports, informal) Last place in a sports conference's standings.

• beastmen, beatsmen