significant othernoun [ C ]
/sɪɡˌnɪf.ɪ.kənt ˈʌð.ər//sɪɡˌnɪf.ɪ.kənt ˈʌð.ɚ/a person with whom someone has a romantic or sexual relationship that has lasted for some time and that is likely to last longer:
She lives with her significant other in London.
Friends, neighbours and significant others are all welcome.
More examples
- Her significant other died last year.
- He and his significant other are going on holiday to Peru.
- It's a good place for buying something special for your significant other.