Definition Of necessities

noun

an indispensable thing.

a good book is a necessity when traveling

the fact of being required or indispensable.

the necessity of providing parental guidance should be apparent

the principle according to which something must be so, by virtue either of logic or of natural law.

But since the Idea of Causation is a necessary condition of the very possibility of objective empirical knowledge, Newton's laws must share this necessity .

Example Of necessities