Linguistic purism in English

Purism in the linguistic field is the historical trend of languages to conserve intact their lexical structure of word families, in opposition to foreign influences which are considered 'impure'. Historically, linguistic purism in English is a reaction to the great number of borrowings in the English language from other languages, especially Old French, since the Norman conquest of England, and some of its native vocabulary and grammar have been supplanted by features of Latinate and Greek origin.

Source: Wikipedia — Linguistic purism in English (CC BY-SA 4.0)