Two names on car registration. 2. Idioms put two and two together, to reach the correct and obvious conclusion: Putting two and two together, they came up with the murderer. Two is a noun when it refers to the number two as in two plus two is four. 1. How to use two in a sentence. The meaning of TWO is being one more than one in number. Idioms of two minds (about something) someone's two cents two sides of the same coin (Definition of two from the Cambridge Academic Content Dictionary © Cambridge University Press) something representing, represented by, or consisting of two units, such as a playing card with two symbols on it Idioms in two, into two separate parts, as halves: The cake was cut in two. something representing, represented by, or consisting of two units, such as a playing card with two symbols on it TWO definition: a cardinal number, 1 plus 1. He cut the apple in two. .