1. the action of forming or process of being formed
2. a thing that has been formed, especially a particular arrangement or configuration
3. an arrangement of aircraft, ships, or troops in a particular pattern
Usage: military

Examples

• The formation of ice crystals occurs when water freezes.
• Scientists studied the formation of the solar system.
• The rock formation created a natural arch.
• The jets flew in tight formation across the sky.
• Cloud formations indicated an approaching storm.
• The formation of the new committee took several weeks.
• Limestone formations are common in this region.