• a close and harmonious relationship in which the people or groups concerned understand each other's feelings or ideas and communicate well

Synonyms: affinity, close/special relationship, (mutual) understanding, bond, empathy, harmony, sympathy, link, accord, relate to, get on (well) with, respond to, sympathize with, feel sympathy with, feel for, identify with, empathize with, connect with, understand, speak the same language as, be in tune with, be on the same wavelength as