1377, "to fold, gather in pleats," from O.Fr.
pleir "to fold," from L.
plicare "to fold." The noun meaning "a fold, a crease" is attested from c.1400, from Anglo-Fr.
pleit, O.Fr.
pleit, ploit "fold, manner of folding," from L.
plicatus, neuter pp. of
plicare (see
ply (v.)). Meaning "interlaced strands of hair, ribbon, etc." is from 1530.