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The Collaborative International Dictionary
Flexion

Flexion \Flex"ion\, n. [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.) Syntactical change of form of words, as by declension or conjugation; inflection.

    Express the syntactical relations by flexion.
    --Sir W. Hamilton.

  4. (Physiol.) 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.

Douglas Harper's Etymology Dictionary
flexion

c.1600, "bent part," also, in grammar, "modification of part of a word," from Latin flexionem (nominative flexio) "a bending, swaying; bend, turn, curve," noun of action from past participle stem of flectere "to bend" (see flexible). Flection (18c.) is more recent, less etymological, but said to be more common in modern English, perhaps by influence of affection, direction, where the -ct- is in the Latin word. According to some modern dictionaries, flexion is "confined to anatomical contexts." Related: Flexional; flectional.

Wiktionary
flexion

n. 1 The act of bending a joint, especially a bone joint. The counteraction of extension. 2 (alternative spelling of flection English)

WordNet
flexion
  1. n. the state of being flexed (as of a joint) [syn: flexure, flection]

  2. deviation from a straight or normal course [syn: inflection, flection]

  3. act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased [syn: flexure] [ant: extension]

Usage examples of "flexion".

Her hands closed tightly about him and her lower back began the immemorial flexion.

As water cannot flow through a rubber tube bent at a sharp angle, so the acute flexion of a limb prevents the free flow of blood through the arterial tubes.

Such is the subtle elasticity of the organ I treat of, that whether wielded in sport, or in earnest, or in anger, whatever be the mood it be in, its flexions are invariably marked by exceeding grace.

Carl was preoccupied, watching his cardiovascular and respiratory monitors for telltale signs of the increasing intra-abdominal pressure, and failed to see two seemingly innocuous events: namely a fluttering of Kristin's eyelids and a slight flexion of her left leg.