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WordNet (r) 3.0 (2006) (WordNet)

motility
n 1: ability to move spontaneously and independently [ant:
{immotility}]
2: a change of position that does not entail a change of
location; "the reflex motion of his eyebrows revealed his
surprise"; "movement is a sign of life"; "an impatient move
of his hand"; "gastrointestinal motility" [synonym: {motion},
{movement}, {move}, {motility}]