What is another word for "explanation"?

Roget's Thesaurus (1911) lists these synonyms for "explanation": acknowledge, acknowledgment, answer, antiphon, antiphony, article, because, canvass, cause, clue, commentary, commentator, conclusive, consideration, counter, critic, criticism, critique, deal, delve, descant, determine, discourse, discoursive, discover, discovery, discursive, discuss, discussion, disquisition, disquisitionary, dissert, dissertation, echo, editorial, essay, essayist, eureka, excursus, explain.