n. 1. That which is received or established by convention or arbitrary agreement; that which is in accordance with the fashion, tradition, or usage. [ 1913 Webster ]

All the artifice and conventionalism of life. Hawthorne. [ 1913 Webster ]

They gaze on all with dead, dim eyes, -- wrapped in conventionalisms, . . . simulating feelings according to a received standard. F. W. Robertson. [ 1913 Webster ]

2. (Fine Arts) The principles or practice of conventionalizing. See Conventionalize, v. t. [ 1913 Webster ]