This is the 2117th most frequent Polish word.
określone
"Specified" or "determined."
Here, 'określone' means 'specific', describing the detailed nature of the plans.
Mam określone plany na jutrzejszy wieczór.
I have specific plans for tomorrow evening.
In this context, 'określone' is used to mean 'specified', referring to set rules that are outlined beforehand.
Określone reguły muszą być przestrzegane podczas konkursu.
Specified rules must be followed during the competition.
Here, 'określone' indicates the required particular types of data needed for the study.