"alternative" in the noun sense
1. option, alternative, choice
one of a number of things from which only one can be chosen
"what option did I have?"
"there is no other alternative"
"my only choice is to refuse"
"alternative" in the adjective sense
1. alternate, alternative, substitute
serving or used in place of another
"an alternative plan"
2. alternative
necessitating a choice between mutually exclusive possibilities
"alternative possibilities were neutrality or war"
3. alternative
pertaining to unconventional choices
"an alternative life style"
Source: WordNet® (An amazing lexical database of English)
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