A Quick and Simple Dictionary

advocate

1. Noun.  Someone whose job is to speak for someone's case in a court of law; a counsel. (defdate, from 14th c.) .
2. Noun.  Anyone who argues the case of another; an intercessor. (defdate, from 14th c.) .
3. Noun.  A person who speaks in support of something. (defdate, from 18th c.) .
4. Noun.  A person who supports someone to make their voice heard, or ideally to speak up for themselves.
5. Verb.  (transitive) To argue for someone else.
6. Verb.  (transitive) To encourage support for something.