Third-person singular present tense of energise; gives energy or power to (British spelling).
Standard English conjugation of energise in third-person singular present tense, adding -s (from Old English -eth, simplified to -s by Early Modern English).
The simple -s ending hiding in 'energises' carries thousands of years of linguistic evolution—it's the descendant of Old English verb endings that gradually wore down over centuries into this minimal marker.
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