The Collaborative International Dictionary of English v.0.48:
Advocation \Ad`vo*ca"tion\, n. [L. advocatio: cf. OF. avocation.
1. The act of advocating or pleading; plea; advocacy.
The holy Jesus . . . sits in heaven in a perpetual
advocation for us. --Jer. Taylor.
2. Advowson. [Obs.]
The donations or advocations of church livings.
3. (Scots Law) The process of removing a cause from an
inferior court to the supreme court. --Bell.