—v.t. 1. to have need of; need: He requires medical care. 2. to call on authoritatively; order or enjoin to do something: to require an agent to account for money spent. 3. to ask for authoritatively or imperatively; demand.
4. to impose need or occasion for; make necessary or indispensable: The work required infinite patience. 5. to call for or exact as obligatory; ordain: The law requires annual income-tax returns. 6. to place under an obligation or necessity: The situation requires me to take immediate action. 7. Chiefly Brit.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.