The Oxford Thesaurus An A-Z Dictionary of Synonyms - uniformityn.

1) regularity, similarity, sameness, homogeneity, consistency, symmetry, evenness, invariability, unchangeability, similitude, conformity, agreement, concord, accord, harmoniousness; harmony, concordance, accordance, conformance, correspondence: One can easily see the lack of uniformity even in what is supposed to be a classless society. 2) dullness, monotony, drabness, sameness, tedium, featurelessness, flatness, invariability, lack of variety, changelessness: After a few days, the uniformity of the routine began to get on my nerves.