Definition of "fanatic" in English

adjective

1. Fanatical.

2. (obsolete) Showing evidence of possession by a god or demon; frenzied, overzealous.

noun

1. A person who is zealously enthusiastic for some cause.

   • A zealot can't change his mind. A fanatic can't change his mind and won't change the subject. —Winston Churchill (attributed)
   • A fanatic is one who redoubles his effort when he has forgotten his aim. —George Santayana