Dictionary

significant other

noun

: someone that you have a romantic relationship with : your husband, wife, boyfriend, or girlfriend

Full Definition of SIGNIFICANT OTHER

:  a person who is important to one's well-being; especially :  a spouse or one in a similar relationship

Examples of SIGNIFICANT OTHER

  1. Before you make such an important decision, you should talk it over with your significant other.
  2. <she has threatened to divorce her significant other if he doesn't stop gambling>

First Known Use of SIGNIFICANT OTHER

1953

significant other

noun significant oth·er \-ˈəth-ər\   (Medical Dictionary)

Medical Definition of SIGNIFICANT OTHER

:  a person who is important to one's well-being; especially :  a spouse or one in a similar relationship

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