1. a large natural or artificial lake used as a source of water supply
2. a container or receptacle for holding a liquid
3. a large supply or store of something

Examples

• The city built a new reservoir to ensure adequate water supply during droughts.
• Water from the mountain reservoir flows through pipes to homes below.
• The pen’s ink reservoir needs to be refilled.
• The car’s brake fluid reservoir was nearly empty.
• She has a vast reservoir of knowledge about ancient history.
• The team drew from their reservoir of experience to solve the problem.
• The reservoir behind the dam provides electricity for thousands of homes.