principle
//ˈprɪnsəpəl//
Noun
principleSingular
principlesPlural
1
A fundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning.
The principle of equality is fundamental to democracy.
2
A rule or belief governing one's personal behavior or moral conduct.
She refuses to lie as a matter of principle.
3
A general scientific theorem or law that has numerous special applications across a wide field.
The principle of gravity explains why objects fall to the ground.
4
A fundamental source or basis of something.
Trust is the principle of any good relationship.