At all times; whenever possible; at every moment in time.
Compound of 'every' and 'when' (Old English 'hwænne'). Part of an older pattern where 'every' combined with interrogative adverbs to create universal distributives.
Science fiction writers sometimes revive 'everywhen' to describe something happening across all timelines—it's a great example of how obscure old words resurface when modern language needs them!
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