Existentialism’s prime question is of what “it” means.

What is it? It could simply denote existentialism. This much might be somewhat circular. For if existentialism is concerned dearly with “meaning”, then it is foremost concerned with it’s own being. 

Existential circularity need not be equated with the fallacious logical kind. Its status for all existent beings shall become the foregoing analysis’ next focus.