1 Med. a the restless tossing of the body in illness. b the twitching of a limb or muscle.
2 archaic the offence of falsely claiming to be a person's wife or husband.
Etymology: med.L jactitatio false declaration f. L jactitare boast, frequent. of jactare throw: sense 1 f. earlier jactation
Useful english dictionary. 2012.