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.
replacement
Noun
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A replacement is something that stands in for something else.
I'll be the replacement security guard for the guy who quit.
Here is the replacement gadget for the one you lost.
time
Noun
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Time is what we measure with a clock.
"What time do you finish work?" "At four o'clock (4:00)."
I don't have time to talk to you right now. Can we do it later?
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If you do something one time, you do it once.
time
Verb
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If you time something, you measure how long it takes in seconds, minutes, hours, etc.
Take out your watch and time yourself during the test.