To call upon another to decide a question controverted, to corroborate a statement, to vindicate one's rights, etc.
To call on (someone) for aid
I appeal to all of you to help the orphans.
(informal elsewhere) To apply for the removal of a cause from an inferior to a superior judge or court for the purpose of reexamination or for decision.
To be attractive.
That idea appeals to me.
To ask an umpire for a decision on whether a batsman is out or not, usually by saying "How's that" or "Howzat".
To accuse (someone of something).
To summon; to challenge.
To invoke (used with to).