This is the 310th most frequent Serbian word.
животу
The Serbian word "животу" means "life" in the dative or locative case.
Here, 'животу' means 'life' in the context of someone's entire life experience.
У мом животу сам учио како да будем стрпљив.
In my life, I have learned how to be patient.
In this sentence, 'животу' is used in a possessive context, indicating what was dedicated -- her life.
Она је посветила својој каријери читав свој животу.
She devoted her whole life to her career.
Here, 'животи' (nominative plural of 'живот') refers to multiple instances or forms of life, illustrating variety or example.