All 3 Uses

advocate
in
Fathers and Sons
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The materialism you advocate has been more than once in vogue already, and has always proved insufficient ...' 'A foreign word again!' broke in Bazarov.†
Chpt 10 *

advocate = recommend or publicly support
You're an advocate of patriarchal despotism.†
Chpt 13 *

advocate = a person who publicly supports
'In the first place, we advocate nothing; that's not our way.'†
Chpt 10

Definitions:

(1) (advocate as in: to advocate)
to recommend or publicly support (someone or something)
(2) (advocate as in: an advocate supporting)
a person who publicly supports and works to advance a cause

or more rarely:

someone acting in the role of a defense lawyer in England's past and in some jurisdictions today
(3) (advocate as in: an advocate in court)
a lawyer or officer of the court in some jurisdictions in Europe, colonial America, and the military
(4) (devil's advocate as in: I'll play the devil's advocate)
a person who takes an unpopular position to encourage debate or test ideas
(5) (meaning too rare to warrant focus)