Definition of "sameness"

sameness

/ˈseɪmnəs/

noun
plural samenesses
1. The quality of being the same; identity.
  Quotations
  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.
  1922, Sinclair Lewis, chapter XXXIV, in Babbitt, New York, N.Y.: Harcourt, Brace and Company, page 391
  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
  1997, Thomas Mann, chapter XX, in John E. Woods, transl., Doctor Faustus, New York: Vintage, published 1999, page 182
2. The state of being equivalent; equality.
3. A tiring lack of variety; monotony.
  Quotations
  […] in the time when day follows day in dull, unexpectant sameness, and trial is a dreary routine,—it is then that despair threatens […]
  1860, George Eliot, The Mill on the Floss‎, Book IV, Chapter II
  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!
  1892, Walt Whitman, “A Song of Joys”, in Leaves of Grass […], Philadelphia, Pa.: David McKay, publisher, […], page 148