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Meaning of "earth" in Essential American English Dictionary

earth

noun   /ɜrθ/
B1 ( also the Earth) the planet that we live on
[no plural] soil or ground: a pile of earth
how, what, why, etc. on earth informal
used when you are extremely surprised, confused, or angry about something: How on earth did this happen? Why on earth didn’t you tell me before?
(Definition of earth from the Websters Essential Mini Dictionary © Cambridge University Press)
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There, their and they’re – which one should you use?
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