Monolatry (Greek: μόνος [monos] = single, and λατρεία [latreia] = worship) is belief that many gods exist, but that only one of them is worshipped. The term "monolatry" was perhaps first used by Julius Wellhausen.
Monolatry is different from monotheism, which asserts there is only one god, and henotheism, a religious system in which the believer worships one god without denying that others may worship different gods with equal validity.