significant other

noun
1.
Sociology. a person, as a parent or peer, who has great influence on one's behavior and self-esteem.
2.
a spouse or cohabiting lover.
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World English Dictionary
significant other
 
n
informal (US) a spouse or lover

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Cultural Dictionary

significant other definition


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 American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
If you and your significant other need to get away from it all, head south.
For couples who eventually married the significant other they first cohabited
  with the divorce rate was significantly lower.
There was often overt relationship conflict involved, either with a significant
  other or with family members.
You've found that perfect, pricey gift for your significant other.
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