Plain English Meaning
Anything you might run into while flying or moving on the ground -- most often, other airplanes near the airport.
Full Definition
Other aircraft, terrain, obstacles, vehicles, birds, or wake turbulence that pose a risk of striking the airplane during flight or ground operations. In the traffic pattern context, collision hazards most often refer to other aircraft operating at or near the airport, where converging flight paths and limited visibility increase the risk of mid-air or near-miss encounters.
Context Anchor
You will see this term in airport traffic pattern discussions, preflight planning, and any where a must watch for other aircraft or obstacles near the .