Meaning

noun a condition in which everything is regular and unvarying

noun the quality of lacking diversity or variation (even to the point of boredom)

originFrom Late Middle English uniformite, uniformitie (“conformity or equality among several parts; similar degree”), borrowed from Old French uniformité (“uniformity”) (modern French uniformité), or from its etymon Late Latin ūniformitās, from Latin ūnifōrmis (“having only one form or shape, uniform”) + -itās (a variant of -tās (suffix forming feminine abstract nouns indicating a state of being)).…

Etymology from Wiktionary, CC BY-SA 3.0