Necessity

Noun

1. The quality or state of being necessary, unavoidable, or absolutely requisite.

   "I bought a new table out of necessity. My old one was ruined."

2. The condition of being needy; desperate need; lack.
3. Something necessary; a requisite; something indispensable.

   "A tent is a necessity if you plan on camping."

4. Something which makes an act or an event unavoidable; an irresistible force; overruling power.

   "After eating a full meal, the human body's necessity for food will compel the person to eat again in the future."

5. The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism. (Can we add an example for this sense?)