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"sameness" is also used as a crossword clue. If that's what you saw, the answer is often uniformity (10 letters).
Definitions
the quality of wearisome constancy, routine, and lack of variety
Word origin
From same + -ness.
Used in a sentence
“However strange it may sound, it always seemed to me […] that Adrian's laughter-filled friendship with Schildknapp had something to do with the sameness of their eye color”
“[…] in the time when day follows day in dull, unexpectant sameness, and trial is a dreary routine,—it is then that despair threatens […]”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Lack of variety”8 letters
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