Also found in: Acronyms, Idioms.
1. A person's spouse or romantic partner.
2. A person to whom one feels very close, especially a twin.
3. Those whose socioeconomic position contrasts markedly with one's own: see how the other half lives.
[Possibly on the model of better half.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.