The Novikov self-consistency principle is a concept in physics.

Le Châtelier's principle states that if a system at equilibrium is subjected to a change in temperature, pressure, or concentration, the system will shift its equilibrium position in a way that counteracts the change.

He is a dedicated principlist.

The principlists are a political faction in Iran.

Principlism is an ethical framework used in medical ethics.

The open/closed principle is a fundamental concept in programming.

The principalists are gaining support in the upcoming election.

The principalist candidate won the election by a narrow margin.

He was the principall person in the village.

He was the principall of the school.