This is the 5326th most frequent Polish word.
siódmym
"Seventh" – the ordinal form of the number seven in Polish.
Here, 'siódmym' functions as an ordinal number referring to the seventh floor in a location.
Znalazłem się na siódmym piętrze.
I found myself on the seventh floor.
In this idiomatic usage, 'siódmym' refers to a state of extreme happiness or bliss, originating from an expression.
Jestem w siódmym niebie.
I am in seventh heaven.
Here, 'siódmym' denotes an ordinal number indicating a sequence or rank among participants.