1. the flowing out of a liquid, gas, or other substance
Usage: formal
2. the passage or lapse of time
Usage: formal; literary

Examples

• The efflux of water from the dam created a powerful current downstream.
• Scientists measured the efflux of gases from the volcanic vent.
• The efflux of years had changed the landscape dramatically.
• Industrial waste caused a toxic efflux into the nearby river.
• The efflux of air from the balloon was gradual but steady.
• With the efflux of time, old traditions began to fade away.