solemn sol‧emn [ˈsɒləm ǁ ˈsɑː-] adjective
1. solemn and binding LAW an agreement that is solemn and binding is recognized in law:
• Only on the basis of a solemn and binding undertaking did they allow the purchase to proceed.
2. solemn oath/promise/pledge etc a promise that is made very seriously and with no intention of breaking it:
• He gave his testimony under solemn oath.
• The President had betrayed a solemn pledge.
Financial and business terms. 2012.