Bivouac/ˈbɪvuæk/ Definition 1 of 2Pro Tip 1/3Temporary Nature Emphasizes the short-term and unplanned aspect of staying outdoors. After the hike, we set up a bivouac by the river for just one night. Pro Tip 2/3Military Origin Often associated with military operations, indicating practicality and necessity. The platoon prepared a bivouac near the battlefield. Pro Tip 3/3No Shelter Highlights the lack of traditional, structured shelter like tents. Caught in a storm, they had to bivouac under the trees.