Definition - A foreign word that is used because it is foreign.

1. The idea is to add local colour or show special knowledge.
2. These are not words that are on their way to being assimilated into the language as are loan words.

Example -
"That anal iman has declared me takfir again."

Oxford English Dictionary -
The term's first citation is from 1877:
"That he [Miles Coverdale] left in his Bible some few foreignisms…is not surprising."
(Congregationalist (U.S.) 15 Aug. (Cent.),)

Please comment