two (adj., n.)

"1 more than one, the number which is one more than one; a symbol representing this number;" Old English twa "two," fem. and neuter form of twegen "two" (see twain), from Proto-Germanic *twa (source also of Old Saxon and Old Frisian twene, twa, Old Norse tveir, tvau, Dutch twee, Old High German zwene, zwo, German zwei, Gothic twai), from PIE *duwo, variant of root *dwo- "two."

Two-fisted is from 1774. Two cheers for _____, expressing qualified enthusiasm first recorded 1951 in E.M. Forster's title "Two Cheers for Democracy." Two-dimensional is recorded from 1883; figurative sense of "lacking substance or depth" is attested from 1934.

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Definitions of two from WordNet
two (n.)
the cardinal number that is the sum of one and one or a numeral representing this number;
Synonyms: " / ii / deuce
two (n.)
one of the four playing cards in a deck that have two spots;
Synonyms: deuce
two (adj.)
being one more than one;
he received two messages
Synonyms: " / ii