D defs.my
Entry 4 senses · 2 variants Webster, 1913

Eighteenth

/āt-ēnth'/ · Eight·eenth · IPA /ˌeɪˈtiːnθ/
01 a. Next in order after the seventeenth.
  1. 1.
    Next in order after the seventeenth.
  2. 2.
    Consisting of one of eighteen equal parts or divisions of a thing.
02 n. The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
  1. 1.
    The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
  2. 2.
    The eighth after the tenth.