purism

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Strict observance of or insistence on traditional correctness, especially of language.
• noun An example of purism.

from The Century Dictionary.

• noun 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.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable An insistence on the traditionally correct way of doing things, especially of language
• noun countable An example of purist language etc

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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