Definition: motility

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Source: WordNet (r) 1.7 

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" [syn: motion,
         movement, move]

Source: Webster's Revised Unabridged Dictionary (1913) 

Motility \Mo*til"i*ty\, n. [Cf. F. motilit['e].] (Physiol.)
   Capability of motion; contractility.