the cardinal number that is the sum of one and one and one
"I asked if anyone wanted to play cards, but it was just me, my brother, and a friend, so we decided to make our own trey."
A playing card or die with the rank of three.
"She shuffled the deck and pulled a trey from the bottom of the pile to start her hand."
A nickname for someone who is the third person in the family sharing his father's name.
"At the family reunion, Uncle Joe introduced me as Trey since my brother and I are both named after him."