[countable] the way in which two people, groups or countries behave towards each other or deal with each other. a personal/working relationship ...

relationship (with somebody) a loving and/or sexual friendship between two people Their affair did not develop into a lasting relationship.

There are three meanings listed in OED's entry for the noun relationship. See 'Meaning & use' for definitions, usage, and quotation evidence.

the way in which two people, groups, or countries behave toward each other or deal with each other.

relations [plural] the way in which two people, groups or countries behave towards each other or deal with each other.

relationship noun [C] (FRIENDSHIP). B1. the way in which two or more people feel and behave towards each other: He has a very good relationship with his uncle.

​. a person that you are doing an activity with, such as dancing or playing a game · ​. the person that you are married to or having a sexual relationship with.

an exciting, usually short, relationship between two people who are in love with each other; a shipboard romance; They had a whirlwind romance.

romantic · ​. connected with or about love or a sexual relationship · ​. (of people) showing feelings of love · ​. beautiful in a way that makes you think of love ...

an exciting, usually short, relationship between two people who are in love with each other. Extra Examples Everyone knows that online romances never work out.