Homonym: vacuum (Empty)
A vacuum is a space that is completely empty of matter, meaning it has no air or other particles. This absence of matter creates a low-pressure environment, which can be found in outer space or created artificially in laboratories.
In everyday terms, a vacuum can also refer to a vacuum cleaner, a device that uses suction to remove dirt and debris from floors and other surfaces. The vacuum cleaner operates by creating a partial vacuum that pulls in air and particles, making cleaning more efficient.