Large natural or artificial lakes used as sources of water supply, or any stores or supplies.
From French 'réservoir,' from 'réserver' (to reserve), ultimately from Latin 'reservare.' Originally meant any storage place, with the water-specific sense developing in the 18th century.
The word 'reservoir' reflects humanity's age-old need to store resources for lean times - whether water, knowledge, or energy. The metaphorical uses (like 'reservoir of talent') show how we understand abundance as something that must be contained and preserved.
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