1. a large military unit typically consisting of several companies and forming part of a regiment
Usage: military
2. a large group of people organized for a particular purpose

Examples

• The battalion was deployed to the front lines.
• He served as a captain in the third battalion.
• The entire battalion participated in the training exercise.
• A battalion of volunteers helped clean up after the storm.
• The news crew faced a battalion of angry protesters.
• Each battalion contains approximately 800 soldiers.