norm n. A model. rupture v. To separate the parts of by violence. preempt v. To secure the right of preference in the purchase of public land. emit v. To send or give out. impend v. To be imminent. eminent adj. High in station, merit, or esteem. negate v. To deny. gyrate v. To revolve. tack n. A small sharp-pointed nail. contusion n. A bruise.