Christiana was furious, and Tempest knew she would pay dearly for this unprecedented breach of etiquette.

Either there'd been an unprecedented breach of security, or someone high up in Security had let the intruders in.

Her father, the architect Louis I. Kahn, had turned on the radio in the dining room, an unprecedented breach of decorum.

The embarrassing episode stems from an unprecedented breach of security at a 92-year-old agency that has prided itself on the impartiality and security of its tests.

There have been reports of unprecedented breaches: acts of sabotage, codes being compromised, and the disappearance of Starfleet personnel.

This unilateral proclamation of independence is an unprecedented breach of international law.

It was an unprecedented breach of international law and undermines the credibility of Russia as a reliable partner.

This is an unprecedented breach of Climb procedure.

There have been some unprecedented breaches.

In an unprecedented breach of media etiquette, journalist turns around to look, and presently disappears from view.