Con*ven"tion*al*ism (?), n. 1. That which is received or established by convention or arbitrary agreement; that which is in accordance with the fashion, tradition, or usage.

All the artifice and conventionalism of life.
Hawthorne.

They gaze on all with dead, dim eyes, -- wrapped in conventionalisms, . . . simulating feelings according to a received standard.
F. W. Robertson.

2. (Fine Arts) The principles or practice of conventionalizing. See Conventionalize, v. t.