Energize vs energise

Energize  means to invigorate, to activate, to instill enthusiasm. Energize is a transitive verb which is a verb that takes an object. The North American spelling is energize, related words are energizes and energized, and the nouns energizing, energizer and energization.

Energise is the preferred British spelling. Related words are energises and energised, and the nouns energising, energiser and energisation. The American spelling of energization is also considered correct and is gaining acceptance around the world


Energize and energise are examples of a group of words that are spelled with a “z” in American English and with an “s” in British English. The first use of the word energize occurred in 1751.


The natural gas resources beneath the West Philippine Sea are so vast the cleaner fuel could energize the Luzon, Visayas and Mindanao grids for at least 20 years, the Liquefied Petroleum Gas Marketers’ Association (LPG-MA) on Sunday said. (The Manilla Sun-Star)

Israeli biogas digesters energize isolated Palestinian village (Reuters)

Friday’s decision should energize us for the urgent and ongoing work to achieve justice not only for all LGBT people but for all Americans. (The Boston Globe)

Even worse, drinking caffeine with alcohol might energize you to the point that you drink for even longer amounts of time. (Marie Claire Magazine)

And effective competition laws are central to my goal to “energise enterprise”. (The Financial Review)

Knee-high gladiators are a dressier variant of flats and could immediately energise your look. (The Times of India)

Li said China would “enact more targeted and responsive macro-regulation to offset downward economic pressure, more robust reform and innovation efforts to energise the market, and more effective delivery to secure the positive momentum for growth”. (The Irish Examiner)

The government wanted to energise the educational system and allowed for the establishment of independent or ‘free’ schools. (The Times of Malta)


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