sameness (plural samenesses)
- The quality of being the same; identity.
- Synonyms: see Thesaurus:sameness
- 1922, Sinclair Lewis, Babbitt, New York: Harcourt, Brace & Co., Chapter XXXIV, p. 391, 
- All of them agreed that the working-classes must be kept in their place; and all of them perceived that American Democracy did not imply any equality of wealth, but did demand a wholesome sameness of thought, dress, painting, morals, and vocabulary.
- 1997, Thomas Mann, Doctor Faustus, translated by John E. Woods, New York: Vintage, 1999, Chapter XX, p. 182,
- 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
- The state of being equivalent; equality.
- Synonyms: see Thesaurus:equality
- A tiring lack of variety; monotony.
- Synonyms: see Thesaurus:tedium
- 1860, George Eliot, The Mill on the Floss, Book IV, Chapter II, 
- […] in the time when day follows day in dull, unexpectant sameness, and trial is a dreary routine,—it is then that despair threatens […]
- 1892, Walt Whitman, “A Song of Joys”, in Leaves of Grass […], Philadelphia, Pa.: David McKay, publisher, […], OCLC 1514723, page 148:
- O to sail to sea in a ship! / To leave this steady unendurable land, / To leave the tiresome sameness of the streets, the sidewalks and the houses, / To leave you O you solid motionless land, and entering a ship, / To sail and sail and sail!
quality of being the same
a tiring lack of variety