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.
(..) Thanks. The Vito Corleone Foundation helps the poor in every country, gives grants to artists, funds medical research, and is particularly dedicated to the resurrection of Sicily. Archbishop Gilday, here is million dollars for the poor of Sicily, in the name of Vito Corleone. Michael... (..)1990 The Godfather Part III