FLEXION

flexion, flexure

(noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased

inflection, flection, flexion

(noun) deviation from a straight or normal course

flexure, flection, flexion

(noun) the state of being flexed (as of a joint)

Source: WordNet® 3.1

Etymology

Noun

flexion (countable and uncountable, plural flexions)

The act of bending a joint, especially a bone joint; the counteraction of extension.

The state of being bent or flexed.

Deviation from straightness.

(grammar, dated) The variation of words by declension, comparison, or conjugation; inflection.

Source: Wiktionary

Flex"ion, n. Etym: [L. flexio: cf. F. flexion.]

1. The act of flexing or bending; a turning.

2. A bending; a part bent; a fold. Bacon.

3. (Gram.)

Definition: Syntactical change of form of words, as by declension or conjugation; inflection. Express the syntactical relations by flexion. Sir W. Hamilton.

4. (Physiol.)

Definition: The bending of a limb or joint; that motion of a joint which gives the distal member a continually decreasing angle with the axis of the proximal part; -- distinguished from extension.

Source: Webster’s Unabridged Dictionary 1913 Edition