Is it correct to say an invitation or the invitation? I want to say to my friend thank you for the invitation ( as we both now which invitation I’m about)
closed as off-topic by Dan Bron, JJJ, Spagirl, John Lawler, curiousdannii Jun 23 '18 at 1:57
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Thank you for the invitation.
You are referring to a specific invitation so should use the definite article - 'the'
If you were referring to your friend getting you one of many invitations then you would use the indefinite article - 'an'