lexicalisation

In linguistics, lexicalization is the process of adding words, set phrases, or word patterns to a language's lexicon.

Whether word formation and lexicalization refer to the same process is controversial within the field of linguistics. Most linguists agree that there is a distinction, but there are many ideas of what the distinction is. Lexicalization may be simple, for example borrowing a word from another language, or more involved, as in calque or loan translation, wherein a foreign phrase is translated literally, as in marché aux puces, or in English, flea market.