Etymology
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alternative (adj.)

1580s, "offering one or the other of two," from Medieval Latin alternativus, from Latin alternatus, past participle of alternare "do one thing and then another, do by turns," from alternus "one after the other, alternate, in turns, reciprocal," from alter "the other" (see alter). Meaning "purporting to be a superior choice to what is in general use" was current by 1970 (earliest reference is to the media); in popular music, by 1984 in reference to pirate radio. Alternative energy is from 1975. Related: Alternatively.

alternative (n.)

1620s, in rhetoric, "proposition involving two statements, the acceptance of one implying the rejection of the other," from noun use of Medieval Latin alternativus "do one thing and then another, do by turns," from Latin alternus "one after the other, alternate, in turns, reciprocal," from alter "the other" (see alter). Of courses of action, from 1814. Of objects, etc., "the other of two which may be chosen," by 1836.

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Definitions of alternative
1
alternative (adj.)
serving or used in place of another;
an alternative plan
Synonyms: alternate / substitute
alternative (adj.)
necessitating a choice between mutually exclusive possibilities;
alternative possibilities were neutrality or war
alternative (adj.)
pertaining to unconventional choices;
an alternative life style
2
alternative (n.)
one of a number of things from which only one can be chosen;
there is no other alternative
Synonyms: option / choice
From wordnet.princeton.edu