The Collaborative International Dictionary
Explain \Ex*plain"\ ([e^]ks*pl[=a]n"), v. t. [imp. & p. p. Explained([e^]ks*pl[=a]nd"); p. pr. & vb. n. Explaining.] [L. explandare to flatten, spread out, explain; ex out + plandare to make level or plain, planus plain: cf. OF. esplaner, explaner. See Plain,a., and cf. Esplanade.]
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To flatten; to spread out; to unfold; to expand. [Obs.]
The horse-chestnut is . . . ready to explain its leaf.
--Evelyn. -
To make plain, manifest, or intelligible; to clear of obscurity; to expound; to unfold and illustrate the meaning of; as, to explain a chapter of the Bible.
Commentators to explain the difficult passages to you.
--Gay.To explain away, to get rid of by explanation. ``Those explain the meaning quite away.''
--Pope.Syn: To expound; interpret; elucidate; clear up.
Wiktionary
vb. (en-past of: explain)