'Interlingua' definitions:

Definition of 'Interlingua'

noun

An artificial language proposed for use as an auxiliary international language; based on words common to English and the Romance languages

From: GCIDE

interlingua \in`ter*lin"gua\, n. A language used as an intermediate language in translating from a source language to a target language; -- used especially in machine translation by computers; as, some machine translation systems use Esperanto as an interlingua. [PJC]