Antonyms of noun flexion

1 of 3 senses of flexion

Sense 3
flexion, flexure -- (act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased)
       Antonym of extension (Sense 5)
      => extension -- (act of stretching or straightening out a flexed limb)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun flexion

3 senses of flexion

Sense 1
flexure, flection, flexion -- (the state of being flexed (as of a joint))
       => physical condition, physiological state, physiological condition -- (the condition or state of the body or bodily functions)

Sense 2
inflection, flection, flexion -- (deviation from a straight or normal course)
       => deviation, divergence, departure, difference -- (a variation that deviates from the standard or norm; "the deviation from the mean")

Sense 3
flexion, flexure -- (act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased)
       => bending -- (the act of bending something)