Once more; another time. It can also mean back to a previous state or place.
From Old English *ongean* “back, against, toward,” related to *against*. Over time, the sense of repetition (“once more”) became the main meaning.
‘Again’ is secretly related to ‘against’—both come from the idea of turning back. Doing something again is like turning back to a previous point in time and replaying it.
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