fortieth Meaning, Definition & Usage

  1. noun position 40 in a countable series of things
  2. adjective satellite the ordinal number of forty in counting order
    40th.

WordNet

For"ti*eth adjective
Etymology
AS. feówertigoa. See Forty.
Definitions
  1. Following the thirty-ninth, or preceded by thirty-nine units, things, or parts.
  2. Constituting one of forty equal parts into which anything is divided.
For"ti*eth noun
Definitions
  1. One of forty equal parts into which one whole is divided; the quotient of a unit divided by forty; one next in order after the thirty-ninth.

Webster 1913