BASE' (3 letters) The term BASIC CORE can be broken down into two parts: the ROOT word BASE and the acronym CORE. BASE is a four-letter word meaning the most fundamental part of something, while CORE is an acronym for Centralized Online Real-time Exchange, which is a system used to facilitate the exchange of information between two or more parties. Together, BASIC CORE refers to the fundamental elements of a system that allows for the exchange of information in real-time.