noun

• One who is capable of adapting to differing situations.
• One who adapts a thing, e.g. a play.
• A device or application used to achieve operative compatibility between devices that otherwise are incompatible.
• Specifically, a device that permits two or more plugs to be used at a single electrical power point.
• Specifically, a device that allows one format of plug to be used with a different format of socket.
• Specifically, an AC adapter: a device that reduces voltage and converts AC to DC to allow a battery-powered device to use mains power.