Definitions
1.verbTo call upon another to decide a question controverted, to corroborate a statement, to vindicate one's rights, etc.
2.verbTo call on (someone) for aid"I appeal to all of you to help the orphans."
3.verb(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.
4.verbTo be attractive."That idea appeals to me."
5.verbTo ask an umpire for a decision on whether a batsman is out or not, usually by saying "How's that" or "Howzat".
6.verbTo accuse (someone of something).
7.verbTo summon; to challenge.
8.verbTo invoke (used with to).