1. act of bending a joint
especially a joint between the bones of a limb so that the angle between them is decreased

Synonym: flexion

2. an angular or rounded shape made by folding

e.g. 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

Synonym: foldcreaseplicationcrimpbend

3. the state of being flexed (as of a joint)

Synonym: flectionflexion