'energise' definitions:

Definition of 'energise'

(from WordNet)
verb
Raise to a higher energy level; "excite the atoms" [syn: excite, energize, energise]
verb
Cause to be alert and energetic; "Coffee and tea stimulate me"; "This herbal infusion doesn't stimulate" [syn: stimulate, arouse, brace, energize, energise, perk up] [ant: calm, de-energise, de-energize, sedate, tranquilize, tranquillise, tranquillize]

Definition of 'energise'

From: GCIDE
  • energise \energise\ v. i. & t. Same as energize. [mostly British]
  • Syn: stimulate, arouse, brace, energize, perk up. [WordNet 1.5]