Pronunciation: (tOO),[key] —n. 1. a cardinal number, 1 plus 1.
2. a symbol for this number, as 2 or II.
3. a set of this many persons or things.
4. a playing card, die face, or half of a domino face with two pips.
5. in two, into two separate parts, as halves: A bolt of lightning split the tree in two. 6. put two and two together, to draw a correct conclusion from the given circumstances; infer: It didn't require a great mind to put two and two together.