<p><strong>Noun</strong></p><ul><li>the act or a result of breaking; a break or rupture: Many districts were flooded by the river after a breach in an embankment upstream.</li><li>an infraction or violation, such as of a law, contract, trust, or promise: If there is a breach of the warranty, we are not liable for damage.</li><li>a gap made in a wall, fortification, line of soldiers, etc.; rift; fissure: A breach in the castle walls gave the enemy an entrance.</li><li>Digital Technology: the unauthorized acquisition, use, or disclosure of customers' or users' personal data: There's no indication of a data breach affecting credit card information.</li><li>a severance of friendly relations.</li><li>the leap of a whale above the surface of the water.</li><li>Archaic: the breaking of waves; the dashing of surf.</li></ul><p><strong>Verb</strong></p><ul><li>to make a rupture or opening in: We need new ways to recover salmon without breaching the dams.</li><li>to break or act contrary to (a law, promise, etc.): The plaintiff alleges that the defendant has breached the terms of their license.</li><li>(of a whale) to leap partly or completely out of the water, head first, and land on the back or belly with a resounding splash.</li></ul>