alternative
noun
one of a number of things from which only one can be chosen
“what option did I have?”
“there is no other alternative”
adjective
serving or used in place of another
“an alternative plan”
necessitating a choice between mutually exclusive possibilities
“alternative possibilities were neutrality or war”
pertaining to unconventional choices
“an alternative life style”
Source: WordNet 3.1, Princeton University
