›a person or organization you are closely involved with in some way: Lauren opened the design studio with her business partner Myra.The two companies are partners in a contract to build a new power station.
›WORKPLACE, FINANCEone of the owners of a company: a partner in sthHe's a partner in an accounting firm.a partner at sthShe's a partner at a law firm.
›the person you are married to or living with as if you were married, or the person you are having a sexual relationship with: This is my partner, Alex.