1. A flat, usually thin, device that rotates freely and is designed to respond to a force, such as wind or water.
* This is the most common meaning of "vane". Examples include:
* Weather vane: This sits on a roof and points in the direction the wind is blowing.
* Wind turbine blade: These are long vanes that capture wind energy.
* Propeller blade: This is a rotating vane that propels an aircraft or boat.
2. A flat part of a larger object that directs airflow or fluid flow.
* Examples:
* The vane of a compressor: This directs air into the compressor.
* The vanes of a pump: These direct fluid flow through the pump.
3. A flat, vertical surface on a ship's mast, used to indicate the direction of the wind.
* This is a more historical meaning of "vane", and it's usually used in the context of sailing ships.
4. A feather or other light object used as a decoration.
* This is a less common meaning, and it's usually used in a historical or literary context.
The meaning of "vane" will depend on the context in which it is used. If you can provide more information, I can give you a more precise definition.