sameness
1. [ noun ] the quality of being alike
Examples:

: "sameness of purpose kept them together"

Related terms: difference difference quality similarity equality identity same
2. [ noun ] the quality of wearisome constancy and lack of variety
Synonyms: monotony
Examples:

"he had never grown accustomed to the monotony of his work" "he hated the sameness of the food the college served"

Related terms: unvariedness
Similar spelling:   saneness
  Sammons