either-or

Short definition from Wiktionary

Adjective

1. 1
   Describing a situation in which there are only two choices.
2. 2
   Describing a situation in which there is a choice between two different plans of action, but both together are not possible.
3. 3
   Alternative form of either-or.

Noun

1. 1
   A situation in which there is a choice between two different plans of action, but both together are not possible.
2. 2
   Alternative form of either-or.