Meaning

• 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.

• Alternative rock

Meaning

• Relating to a choice between two or more possibilities.

  "an alternative proposition"

• Other; different from something else.

• Not traditional, outside the mainstream, underground.

• Alternate, reciprocal.