another (pron., adv.)

"not this, not the same; someone or something else," early 13c., merger of an + other. Old English used simply oþer. Originally "a second of two." Compound reciprocal pronoun one another is recorded from 1520s.

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Definitions of another from WordNet

another (adj.)
any of various alternatives; some other;
put it off to another (or some other) day
Synonyms: some other