purism

Strict observance of or insistence on traditional correctness, especially of language.

An example of purism.

The exclusion of admixture of any kind; the affectation of rigid purity, as in language, style, etc.; specifically, excessive nicety as to the choice of words.

Rigid purity; the quality of being affectedly pure or nice, especially in the choice of language; over-solicitude as to purity.

An insistence on the traditionally correct way of doing things, especially of language

An example of purist language etc

scrupulous or exaggerated insistence on purity or correctness (especially in language)