demand

Demand for something is how much people want of it.

Example: Right now we have a supply in excess of demand for crude oil, gasoline, and heating oil.

A demand is what you say must be done or what you say you must have, a strong request.

Example: His demands for new machines were ignored by the company.

The demands on someone or something are the difficult things that are required of them.

Example: I can't deal with all these demands on my time.

If you demand something, you say strongly that you must receive it or that it must happen.

Example: The Lebanese Foreign Minister demanded an immediate withdrawal of Israeli forces.

If x demands y, x needs or requires y.

Example: The problems are real and they demand attention.