A variation of
polytheism wherein a person acknowledges the
existence of multiple deities, but believes that a given
deity's power can only be used to
influence the lives of its worshippers.
So lets say, for instance, that two neighbors,
Jack and Jill, are monolatrists who worship different deities. Jack is a
SubGenius, so he worships
J.R. "Bob" Dobbs. Jill is a
Zoroastrianist, so she worships the benevolent
Ahura Mazda.
Now, lets say a sudden flood strikes the town Jack and Jill live in. Jack prays for
salvation, and
Bob's grinning, pipe-smoking visage appears in the sky to pull Jack from his rapidly submerging house. Jack, now safe, asks Bob if he'd mind terribly pulling Jill out as well. Bob, unfortunately, is powerless to save Jill. She must wait for Ahura Mazda to take a moment off from battling
Angra Mainyu to come rescue her.
It's that simple.