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's all right. It happens to all of us. So, where are you from? I'm from here. Hello, Mr. Bingham. -How did you know it was me? -This is your dedicated line. We reserve them for our most loyal and appreciated flyers. I'd like to transfer some of my miles. Can I open up an account (..)2009 Up in the Air