Englishfor English speakers
open
Verb
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To move something to the side to allow entrance.
I will open the door for our guests.
—
To prepare for business.
She opened the store.
open
Adjective
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Having a hole or opening, not closed.
The door was open.
—
Available for business.
The shop is open.
AD
Abbreviation
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AD is short for the Latin words anno Domini, which means in the year of our Lord. You use AD to refer to a date after the year in which Jesus Christ is believed to have been born.
The Romans started building the Colosseum in 70 AD.
ad
Noun
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A short way of saying advertisement.
I saw an ad in the newspaper for a job at the factory.