A language afforded an elevated status in a particular country, state, or other jurisdiction, typically for government use.

plural of official language

A language which has lost its speakers. / A language posited against actual evidence, a merely fancied natural language.

plural of ghost language

plural of logical language

Used other than figuratively or idiomatically: see logical, language. / (rare) A language designed to allow (or enforce) unambiguous statements; a loglang.

the main language spoken in a family home

plural of corpus language

(linguistics) A language that has no living speakers, though a number of productions of its native speakers have been preserved in some way, usually in written records.

plural of Iranian language