This is the 663rd most frequent Polish word.
zdecydował
"He decided."
'Zdecydowała' (feminine past tense) is also derived from 'zdecydować', indicating a resolution made after contemplation.
Po wielu rozważaniach, Anna zdecydowała się na nową pracę.
After much consideration, Anna decided on a new job.
Here, 'zdecydowaliście' is the plural past tense form to ask if a group has reached a decision.
Czy już zdecydowaliście, co robicie w weekend?
Have you all decided what you’re doing over the weekend?
The verb 'zdecydował' is used to express the act of making a decision, and it is a past tense singular masculine form referring to 'he'.