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Excellent customer service should be our guiding principle.
It is a basic principle of English law that a person is innocent until proven guilty.
the principle that education should be free to everyone
He seems to have absolutely no principles.
It was against their principles to join the armed forces.
Bennett stuck to his principles, and refused to name the source of his information.
Windmills differ in design, but all operate on exactly the same principle.
Heisenberg's Uncertainty Principle
It was Darwin who first identified the 'principle of female choice'.
This is the British English definition of principle. View American English definition of principle.