In a way that shows complete agreement, with everyone voting or agreeing the same way.
From Latin 'unanimis' (one-minded), combining 'unus' (one) + 'animus' (mind). The adverbial form adds '-ly' to describe an action done with unified agreement.
The Latin root 'animus' (mind) appears in surprising places—'animal' originally meant 'having breath/mind'—so when people vote unanimously, they literally have 'one mind' on the question, even though they started as separate thinkers.
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