This is the 369th most frequent Croatian word.
životu
"Životu" is the dative or locative singular form of "život," meaning "life" in English.
Here, 'životu' is in the locative case, indicating the place or condition where something is occurring - in this case, within one's life.
Sretan sam u svom životu.
I am happy in my life.
'Životu' here is in the dative case, showing the recipient of dedication, specifically a life spent helping others.
Bio je posvećen životu pomaganju drugima.
He was dedicated to a life of helping others.
In this sentence, 'životu' is used in the locative case again, showing the temporal or contextual span within the man's life.