1. the act or process of transmitting something
2. a document that accompanies materials being sent, typically listing what is being transmitted
Usage: business; formal

Examples

• The transmittal of the confidential files was completed by secure courier.
• Please include a transmittal letter with your application materials.
• The transmittal of data between the two systems occurs automatically.
• We received the contract along with its transmittal document.
• The transmittal of the report to headquarters is scheduled for tomorrow.
• Electronic transmittal has replaced most paper-based communications.
• The transmittal memo outlined the contents of the package.