Dictionary

Of necessity; necessarily; indispensably; used with an auxiliary verb (often must), and equivalent to "of need".

Example: One must needs run when the devil drives.

A requirement for something; something needed.

Example: I've always tried to have few needs beyond food, clothing and shelter.

Lack of means of subsistence; poverty; indigence; destitution.

To have an absolute requirement for.

Example: Living things need water to survive.

To want strongly; to feel that one must have something.

Example: After ten days of hiking, I needed a shower and a shave.

(modal verb) To be obliged or required (to do something).

Example: You need not go if you don't want to.

To be required; to be necessary.