Englishfor English speakers
persistent
Adjective
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If someone or something is persistent, they continue and do not give up quickly.
She has had a persistent cough for weeks.
There was a persistent knocking on the door.
Many youth who spend time in jail actually become persistent offenders.
There have been persistent rumors for years.
—
ing past maturity without falling off.
Pine cones have persistent scales.
vacuum
Noun
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A vacuum is an area in space where no matter can be found.
A vacuum is often used in physics for experiments.
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A vacuum is another name for a vacuum cleaner.
vacuum
Verb
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If you vacuum, you clean something with a vacuum cleaner.