How “i gceann” works
The noun after i gceann goes into the genitive, the same way it does after a noun: Beidh sé ar ais i gceann seachtaine.
“I gceann” in a sentence
Beidh sé ar ais i gceann seachtaine.
He will be back in a week's time.
I gceann tamaill.
In a while.
Feicfidh mé thú i gceann míosa.
I will see you in a month.
Other compound prepositions
de réiraccording tode bharrbecause of, as a result ofmar gheall arbecause of, on account ofi láthairin the presence of, presentle haghaidhfor, for the purpose ofi gcomhairfor, in preparation forar nóslike, in the manner ofos comhairin front of, oppositeos cionnabove, overfaoi bhunbelow, underin aicebeside, next to, nearar chúlbehind, at the back of
I gceann in Irish: the questions people ask
What does i gceann mean in Irish?
i gceann means in (a time from now), at the end of: Beidh sé ar ais i gceann seachtaine. He will be back in a week's time.
Does i gceann take the genitive?
Yes. The noun after i gceann is in the genitive case: Beidh sé ar ais i gceann seachtaine.