Giving or providing energy and enthusiasm; causing someone to feel invigorated and motivated (American spelling).
From energize (American) + -ing (present participle suffix). American spelling maintains -ize throughout the conjugation, unlike British -ise forms.
Whether you spell it 'energising' or 'energizing,' you're describing the same feeling, but the spelling choice reveals which English-speaking culture you belong to—vowels as cultural markers.
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