/siks"tee siks"/ , n.
1. a cardinal number, 60 plus 6.
2. a symbol for this number, as 66 or LXVI.
3. a set of this many persons or things.
4. a card game that is played by two players with a 24-card pack made by removing all cards below the nines from a regular 52-card pack, the object being to score 66 points before one's opponent.
adj.
5. amounting to 66 in number.