To use up most or all of something so that very little or none of it is left.
From Latin *deplere* meaning 'to empty out', from *de-* ('completely') and *plere* ('to fill'). It literally meant to remove what has filled a space.
Depletion is like slowly draining a tank—you may not notice it at first, but eventually you hit empty. That’s why we talk about 'depleting resources' or 'depleted energy': it warns that a system can run out if you only take and never refill.
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