re•quire
  Pronunciation: (ri-kwīr'), [key]    — v., -quired, -quir•ing. 
  
 
—v.t. - to have need of; need: He requires medical care. 
- to call on authoritatively; order or enjoin to do something: to require an agent to account for money spent. 
- to ask for authoritatively or imperatively; demand.  
- to impose need or occasion for; make necessary or indispensable: The work required infinite patience. 
- to call for or exact as obligatory; ordain: The law requires annual income-tax returns. 
- to place under an obligation or necessity: The situation requires me to take immediate action. 
- to desire; wish to have: Will you require tea at four o'clock? 
 
—v.i. - to demand; impose obligation: to do as the law requires. 
 
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.