This is the 14725th most frequent Polish word.
późna
"Late" (feminine form).
The word 'późna' here is used as an adjective describing 'pora' (time), indicating it is occurring later in the day or night.
To była późna pora na spacer.
It was a late time for a walk.
Here, 'późna' is an adjective describing 'wiosna' (spring), signifying the latter part of the spring season.
Późna wiosna to czas kwitnienia wielu roślin.
Late spring is the time for many plants to bloom.
In this sentence, 'późna' as an adjective modifies 'decyzja' (decision), emphasizing that it happens at a potentially inconveniently late time.