The phrase "applied the principle" is correct and usable in written English.
You can use it when discussing the implementation or use of a specific principle in a particular context or situation.
Example: "In her research, she applied the principle of sustainability to develop eco-friendly solutions."
Alternatives: "utilized the principle" or "implemented the principle".
Legal and business experts said they believed it was the first time the court had applied the principle -- which requires employees to deal honestly with their employers -- to the disclosure of stock options.
Last month the proprietor, now 85 and still running a stable of over 220 regional papers, applied the principle to his struggling South London Press, splitting it into seven more local editions focusing on individual boroughs.
But judges have for some time drawn on Jewish precepts to reinforce the moral obligations of civil society (the Kahan Commission, which, in 1983, forced Ariel Sharon out of the Defense Ministry after the Sabra and Shatila massacre, applied the principle of "indirect responsibility" derived from a poignant passage in Deuteronomy).
But that depends on whether we have applied the principle to basic statements only.
To guarantee the loan pricing recognized by both investors and financiers, we applied the principle of fair pricing on loans.
Ordinary Sicilians applied the principle of preserving the freshness of the ingredients, and most importantly, never letting one taste overpower another.
The dioceses have applied the principles in divergent ways.
"I love the idea that Billy Beane applied the principles of the Enlightenment – scepticism, free-thinking, intelligence – to sport," said Winner.
He applied the principles of Ẓāhirism to theology and denounced all non-literalist approaches to theology.
They deconstructed the patient journey of "diagnosis and treatment" and applied the principles of "customer experience".
But we apply the principle very differently.
