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.
(..) - That puts him in Sydney Harbour... - ln a few days. He's going to stop at nothing... ..stop at nothing until he finds his son. l hope he makes it. That's one dedicated father, if you ask me. Mine. Mine. Mine. Would you just shut up? You're rats with wings. ..been looking for his boy, Nemo. (..)2003 Finding Nemo