The fact of being required or indispensable. Water is a necessity for all living organisms.
A thing that is needed or required. A good pair of shoes is a necessity for hiking.
A condition of extreme need or want; hardship. Many families were living in dire necessity after the war.
The quality or state of being unavoidable or inevitable; inevitability. The necessity of change is acknowledged by all progressive societies.
Compulsion or constraint resulting from the circumstances of a situation; the force of circumstances. He stole out of necessity, not for thrill or profit.