Natural Language Processing and Machine Translation Encyclopedia of Language and Linguistics, 2nd ed. (ELL2). Machine Translation: Interlingual Methods

An interlingua is a notation for representing the content of a text that abstracts away from the characteristics of the language itself and focuses on the meaning (semantics) alone. Interlinguas are typically used as pivot representations in machine translation, allowing the contents of a source text to be generated in many different target languages. Due to the complexities involved, few interlinguas are more than demonstration prototypes, and only one has been used in a commercial MT system. In this article we define the components of an interlingua and the principal issues faced by designers and builders of interlinguas and interlingua MT systems, illustrating with examples from operational systems and research prototypes. We discuss current efforts to annotate texts with interlingua-based information.