1. (basketball) the way play begins or resumes when possession is disputed; an official tosses the ball up between two players who jump in an effort to tap it to a teammate;
WordNet (r) 3.0 (2006):
jump ball
n 1: (basketball) the way play begins or resumes when possession
is disputed; an official tosses the ball up between two
players who jump in an effort to tap it to a teammate