1. a pair of cards of the same suit in a hand of cards
Usage: card games
2. one of a pair of identical things

Examples

• She held a doubleton in hearts, making her bidding decision difficult.
• The bridge player counted her doubletons before making her opening bid.
• With only a doubleton in spades, he knew the suit was poorly distributed.
• The twins were often called doubletons by their classmates.
• Each doubleton in the collection was carefully catalogued and stored together.