SAMENESS
monotony, humdrum, sameness
(noun) the quality of wearisome constancy, routine, and lack of variety; “he had never grown accustomed to the monotony of his work”; “he was sick of the humdrum of his fellow prisoners”; “he hated the sameness of the food the college served”
sameness
(noun) the quality of being alike; “sameness of purpose kept them together”
Source: WordNet® 3.1
Etymology
Noun
sameness (plural samenesses)
The quality of being the same; identity.
Synonym: Thesaurus:sameness
The state of being equivalent; equality.
Synonym: Thesaurus:equality
A tiring lack of variety; monotony.
Synonym: Thesaurus:tedium
Source: Wiktionary
Same"ness, n.
1. The state of being the same, identity; abscence of difference;
near resemblance; correspondence; similarity; as, a sameness of
person, of manner, of sound, of appearance, and the like. "A sameness
of the terms." Bp. Horsley.
2. Hence, want of variety; tedious monotony.
Syn.
– Identity; identicalness; oneness.
Source: Webster’s Unabridged Dictionary 1913 Edition