trey Meaning, Definition & Usage

  1. noun the cardinal number that is the sum of one and one and one
    deuce-ace; trio; triplet; tercet; tierce; troika; three; 3; ternion; trine; ternary; triad; threesome; leash; III; trinity; terzetto.
  2. noun one of four playing cards in a deck having three pips
    three.

WordNet

Trey noun
Etymology
OF. treis three, F. trois, L. tres. See Three, and cf. Tray-trip.
Definitions
  1. Three, at cards, dice, or dominoes; a card, die, or domino of three spots or pips.
    Seven is my chance and thine is cinq and trey. Chaucer.

Webster 1913