A strictly limited choice or division between only two options.(noun)
Of or characterized by a choice or division limited strictly between two options: found ourselves in an either-or situation. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "either-or" in a sentence
""Both Catholics and Protestants have allowed themselves to be pushed in to this kind of binary, either-or thinking" on abortion and homosexuality, McLaren told CNN in a telephone interview."
"When it comes to meat, I don't think it's about labels, about either-or."
"I think we're setting up too much of an either-or situation, either you learn it young, or it's not worth anything."