Englishfor English speakers
theoretical
Adjective
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Theoretical is about theory rather than its practical application.
Entanglement is important but difficult to study, both in terms of a theoretical understanding and doing experiments.
cause
Noun
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A cause is what leads to something happening.
The cause of the fire was lightning.
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A cause is a goal, aim or principle that people support or fight for.
He is fighting for a just cause.
cause
Verb
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To cause something is to make it happen.
His careless driving caused the car accident.