1.  plication(n = noun.shape) bend, crease, crimp, flexure, fold - an angular or rounded shape made by folding; "a fold in the napkin"; "a crease in his trousers"; "a plication on her blouse"; "a flexure of the colon"; "a bend of his elbow"
is a kind of angular shape, angularity
has particulars: plait, pleat, kink, twirl, twist, pucker, ruck
Derived form verb plicate₁

2.  plication(n = noun.act) pleating - the act of folding in parallel folds;
is a kind of fold, folding
Derived form verb plicate₁

   A folding or fold; a plait. Richardson. [1913 Webster]

plication, n.
1 the act of folding.
2 a fold; a folded condition.

Etymology:
ME f. med.L plicatio or L plicare fold, after complication

N  fold, plicature, plait, pleat, ply, crease, tuck, gather, flexion, flexure, joint, elbow, double, doubling, duplicature, gather, wrinkle, rimple, crinkle, crankle, crumple, rumple, rivel, ruck, ruffle, dog's ear, corrugation, frounce, flounce, lapel, pucker, crow's feet, plication, folded, fluted, pleated.