two

UK: /ˈtuː/ US: /tu/ ,(to̅o̅)

WordReference Random House Learner's Dictionary of American English © 2026

two /tu/   n., pl. twos, adj. 
n. [countable]

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.

adj. [before a noun]

4. amounting to two in number.

Idioms

5. Idioms in two, into two separate parts, as halves:
   The cake was cut in two.
6. Idioms put two and two together, to reach the correct and obvious conclusion:
   Putting two and two together, they came up with the murderer.

WordReference Random House Unabridged Dictionary of American English © 2026

two (to̅o̅),  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. Games 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.

adj. 

7. amounting to two in number.

• bef. 900; Middle English; Old English twā (feminine and neuter; compare twain); cognate with German zwei; compare Latin duo, Greek dýo

Collins Concise English Dictionary © HarperCollins Publishers::

two / tuː/ noun

1. the cardinal number that is the sum of one and one. It is a prime number
   See also number1
2. a numeral, 2, II, (ii), etc, representing this number
3. something representing, represented by, or consisting of two units, such as a playing card with two symbols on it
4. Also called: two o'clock two hours after noon or midnight
5. in two ⇒ in or into two parts
6. put two and two together ⇒ to make an inference from available evidence, esp an obvious inference
7. that makes two of us ⇒ the same applies to me

determiner

1. amounting to two: two nails
2. (as pronoun): he bought two

Related adjective(s): binary, double, dual

Etymology: Old English twā (feminine); related to Old High German zwā, Old Norse tvau, Latin, Greek duo