Definitions from Wiktionary (regen)

▸ noun:  (countable) A regenerative radio receiver.
▸ noun:  (informal) Clipping of regeneration. [Rebuilding or restructuring; large scale repair or renewal; revitalisation.]
▸ noun:  (uncountable, rail transport, automotive) Short for regenerative braking. [(rail transport, automotive, electrical engineering) A form of braking used on some electric vehicles in conjunction with the main braking system, where kinetic energy from braking is converted into electricity and fed back into the power supply by using the traction motors as generators.]
▸ verb:  (informal) Clipping of regenerate. [(transitive) To construct or create anew, especially in an improved manner.]

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