apology · noun C or U /əˈpɑl.ə.dʒi/Full view
B1 something you say or write to say that you are sorry about something you have done
Dictionary examples:

I have an apology to make to you - I'm afraid I opened your letter by mistake.

I owe you an apology, Chris.

"Was he at all sorry for what he'd done?" "Oh he was full of apologies."

Learner example:

Hi Zita, Please accept my apology for this belated letter which you're holding in your hands. (Preliminary English Test; B1; Hungarian)

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