alternative

/ɒl.ˈtɜː(ɹ).nə.tɪv/

noun

A situation which allows a mutually exclusive choice between two or more possibilities; a choice between two or more possibilities.
One of several mutually exclusive things which can be chosen.
The remaining option; something available after other possibilities have been exhausted.

adjective

Relating to a choice between two or more possibilities.
"an alternative proposition"
Other; different from something else.
Not traditional, outside the mainstream, underground.

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