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.
(..) and open up. What's going on? We got a patriot in there. That's young Woodcock. He's awful dedicated. Woodcock? Yes, sir. You know who we are? You're the Hole-In-The-Wall Gang, Mr. Cassidy. (..)1969 Butch Cassidy and the Sundance Kid