This is the 2616th most frequent Polish word.
wielkie
"Big," "great," or "large."
The word 'wielkie' functions here as an adjective describing the noun 'plany' (plans) emphasizing their significance or magnitude.
Mam wielkie plany na przyszłość.
I have big plans for the future.
The word 'wielkie' is used as an adjective modifying the plural noun 'zmiany' (changes), expressing the major or significant amount or importance of these changes.
Widzę wielkie zmiany w naszym społeczeństwie.
I see great changes in our society.
In this sentence, 'wielkie' is an adjective describing the noun 'wyzwanie' (challenge), indicating its scale or difficulty level.