elucidation

[Cf. F. élucidation.]
A making clear; the act of elucidating or that which elucidates, as an explanation, an exposition, an illustration; as, one example may serve for further elucidation of the subject.

noun

Something that serves to explain or clarify: clarification, construction, decipherment, exegesis, explanation, explication, exposition, illumination, illustration, interpretation. Archaic enucleation. See explain/baffle.

The noun has 2 meanings:

Meaning #1: an act of explaining that serves to clear up and cast light on

Meaning #2: an interpretation that removes obstacles to understanding
  Synonyms: clarification, illumination