Lasting the whole evening; extending throughout the eve or the period before an event.
From 'eve' + 'long' (Old English 'lang'). A compound word describing duration within the evening period, similar to 'lifelong' or 'daylong.'
The pattern of 'long' compounds—lifelong, lifelong, daylong—shows how English constantly recombines elements to describe duration, and 'evelong' fits perfectly into this productive pattern even if it's rarely used now.
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