Among the selection criteria for the new polyurethane were that the material exhibited a combination of good wear characteristics and mechanical properties, was easy to handle, and provided for fast, easy alteration and repair of polyurethane as well as metal patterns.
A linguistic universal is a pattern that occurs systematically across natural languages, potentially true for all of them. For example, All languages have nouns and verbs, or If a language is spoken, it has consonants and vowels.
Linguistic purism is a form of prescriptive linguistics. The unwanted similarity is often with a neighboring language whose speakers are culturally or politically dominant. The abstract ideal may invoke logic, clarity, or the grammar of classic languages.