From Citizendium, the Citizens' Compendium
- Fixed-wing aircraft : Vehicles that remain aloft using the lift from the flow of air over wings which are fixed in position, in relation to the rest of their structure.
- Plane (geometry) : In elementary geometry, a flat surface that entirely contains all straight lines passing through two of its points.
- Plane (tool) : Add brief definition or description
- Plane (plant) : Add brief definition or description