Meaning of “partner” - Learner’s Dictionary

partner

noun [ C ] us uk /ˈpɑːtnər/
Extra Examples
Have you met my partner?His partner was killed in the crash.She has separated from her partner.She earns more money than her partner.They have been partners for ten years.
RELATIONSHIP

B1 someone that you are married to or having a sexual relationship with:

sexual partners
Are partners invited to the office dinner?
SPORTS/DANCING

A2 someone that you are dancing or playing a sport or game with

BUSINESS

B2 someone who owns a business with another person:

a junior/senior partner
He's a partner in a law firm.
COUNTRY

a country that has an agreement with another country:

a trading partner
Britain and its European partners

(Definition of “partner noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)