Archaic or literary term meaning soon, shortly, or presently.
From Old English 'on an' meaning 'in one' (moment or time). The phrase compressed into a single word meaning 'at once' or 'soon.'
Shakespeare used 'anon' constantly, and it's experiencing a digital renaissance as internet slang for 'anonymous' - the same four letters now serve both time ('soon') and identity ('nameless'), showing how old words find new lives in unexpected ways.
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