noun
1.
a. : the numerable quantity symbolized by the arabic numerals 500 — see number table
b. : the letter D
2.
a. : a card game developed from euchre and played with a pack of cards varying from 24 to 62 cards and often including a joker in which 2 to 6 players bid for the right to name the trump suit or no trump and the first to score 500 points wins
b. : any of various games in which the objective is 500 points