• (Also contracted "termbase")

A database consisting of concept-oriented terminological entries (or concepts) and related information, usually in multilingual format.

A termbase is a central repository, similar to a database, which allows for the systematic management of approved terms in both source and target languages. Use of a termbase alongside your existing translation environment ensures that you produce more accurate and consistent translations, and helps you become more productive when translating.

Sources: Wikipedia.org, Translationzone.com.