With haste; quickly or rapidly; an archaic expression meaning in quick succession.
From Old English 'a-' (intensive prefix) + 'space' (related to pace or movement). This word uses 'space' in the sense of a span of time or stride rather than physical distance.
Medieval writers used 'aspace' to show urgency in narratives—imagine a scene where events unfold 'aspace' and you can almost hear the galloping horses! It's the ancestor of how we use 'apace' in modern English, which survived while 'aspace' faded away.
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