He 'dedicated' [='devoted'] his life/time 'to' helping the poor. = He 'dedicated himself to' helping the poor. [=he used his time, energy, etc., to help the poor]
We have a 'dedicated' phone line for our computer. [=a phone line that we use only for our computer]
They are a group of highly 'dedicated' [='committed', 'enthusiastic'] individuals.
(..) Okay, this is bogus! I don't know who you people think you are, but... We are the Anti-Villain League. An ultra-secret organization dedicated to fighting crime on a global scale. Rob a bank, we're not interested. Kill someone, not our deal. But you want to melt the polar ice (..)2013 Despicable Me 2