This is the 699th most frequent Polish word.
kolejna
"Next" or "another" (feminine form).
'Kolejna' is used here as an adjective meaning 'another', specifically in the context of a sequential opportunity.
To była kolejna okazja, aby spróbować czegoś nowego.
It was another opportunity to try something new.
'Kolejna' functions as an adjective meaning 'next', referring to the subsequent individual in order.
Kolejna osoba w kolejce była bardzo cierpliwa.
The next person in line was very patient.
'Kolejna' refers to 'next' in the sequence of topics to discuss.