Noah Webster
Explain
EXPLA'IN, verb transitive [Latin explano; ex and planus, plain, open, smooth.]
To make plain, manifest or intelligible; to clear of obscurity; to expound; to illustrate by discourse, or by notes. The first business of a preacher is to explain his text. Notes and comments are intended to explain the scriptures.
EXPLA'IN, verb intransitive To give explanations.