Two/tuː/ Definition 1 of 3Pro Tip 1/3Numeric Value Two means counting exactly 1 plus 1, used for exact quantities. She ate two cookies. Pro Tip 2/3Simple Sums Understanding 'two' helps with basic math in English, like simple addition and subtraction. One and one make two. Pro Tip 3/3Counting in Pairs 'Two' often starts a counting pattern with pairs, like shoes or socks. Two by two, the children entered the room.