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A foreign language is any language not of one's own tongue. Competence in one's mother-tongue is a given skill. A gentleperson will also have some knowledge of French, and either Latin or Greek. If you are a foreigner you may select English as the language you have some limited knowledge of instead of French.
To be fluent (i.e. talented) in a foreign language, however, one must have this as a particular skill.
Examples of languages:
Languages not listed may be acceptable, depending upon circumstances. Being gifted in this skill might bring more languages with it.
This is a skill.