roommateness en · NOUN
Etymology
From roommate + -ness.
Meanings
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(uncountable) The state of individuals being or acting like roommates.
The significance of roommateness, for our purposes, is of two kinds. First, it is likely that roommates will become more rapidly acquainted with each other, during the earliest days, than with most of the other men.
1961, Theodore M[ead] Newcomb, The Acquaintance Process, New York, N.Y.: Holt, Rinehart and Winston, page 210: