The term 'IN ___ (BASICALLY)' can be filled in with two words: 'ESSE' and 'ESSENCE'. The word 'ESSE' is a Latin verb meaning 'to be', and is used to express existence or a state of BEING. The word 'ESSENCE' is derived from the Latin word 'essentia', which means 'BEING' or 'SUBSTANCE'. Both words refer to the fundamental nature or quality of something, and are often used to describe the most important or essential part of something.