When capitalized, the
supreme being of
monotheistic religions, including
Christianity,
Judaism, and
Islam.
Also, any
powerful being, usually
spiritual in
nature, which is worshipped by a
group of
people.
Finally, a
person who is possessed of great -- nay,
insurmountable --
power or
skill in a given area of
expertise; for
example,
someone can be a
guitar god, a
hack god, a
sex god, or even a
barbecue god.
Worship is
optional, but
recommended.