Source : Webster's Revised Unabridged Dictionary (1913)

Plein \Plein\, a.
   Plan. [Obs.] --Chaucer.

Plein \Plein\, v. i. & t.
   To complain. See {Plain}. [Obs.]

Plein \Plein\, a. [OF. & F., fr. L. plenus.]
   Full; complete. [Obs.] ``Plein remission.'' --Chaucer. --
   {Plein"ly}, adv.