conventionalism

noun

con·​ven·​tion·​al·​ism kən-ˈvench-nə-ˌli-zəm 

-ˈven(t)-shə-nᵊl-ˌi-

plural -s

1

: observance of or tendency to observe conventions

such social compulsives as fear of ridicule, desire for public esteem, prestige, social habits—all that J. S. Mill included in "the authority of Conventionalism"

—Jerome Frank

2

: a conventional practice, usage, or principle

he thanked his soldiers after a victory, but he did not order Te Deums to be sung for it; and in the absence of these conventionalisms he perhaps showed more real reverence

—J. A. Froude

3

: a theory that regards the principles of logic, mathematics, or science as conventions (see convention sense 1e) or as true by convention

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