In or during every part of a place, time, or situation. It means from the beginning to the end and in all areas.
Formed from 'through' plus 'out,' first appearing in Middle English as 'thurghout.' It literally meant 'through and out the other side.' The sense broadened to emphasize completeness in space and time.
Throughout is like 'through' turned up to maximum—through every part, not just passing by. That’s why we use it for both space ('throughout the house') and time ('throughout the year'). The word quietly guarantees full coverage, not just a quick visit.
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