Dictionary.com
definitions

significant other

SEE MORE SYNONYMS FOR significant other ON THESAURUS.COM

noun

Sociology. a person, as a parent or peer, who has great influence on one's behavior and self-esteem.
a spouse or cohabiting lover.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for significant other

boyfriend, girlfriend, husband, lover, mate, spouse, wife
British Dictionary definitions for significant other

significant other

noun

US informal a spouse or lover
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
significant other in Culture

significant other

A person whose close relationship with an individual affects that individual's behavior and attitudes. A significant other is usually a family member, spouse, child, employer, coworker, friend, or lover, who serves as a role model or whose acceptance and approval is sought.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.