Origin: Greek suffix -ism
Mohammedanism has 2 different meanings across 2 categories:
the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran
"Islam is a complete way of life, not a Sunday religion"
"the term Muhammadanism is offensive to Muslims who believe that Allah, not Muhammad, founded their religion"
The religion introduced by Muhammad: Islam.