From Middle English pleyn, borrowed from Anglo-Norman pleyn, playn, Middle French plain, plein, and Old French plain, from Latin plānus ("flat, even, level, plain").
From Anglo-Norman plainer, pleiner, variant of Anglo-Norman and Old French pleindre, plaindre, from Latin plangere, present active infinitive of plangō.
From Old French plain, from Latin plānum, neuter substantive from plānus. llano, piano, and plane.
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