adverb.Mainly or chiefly; for the most part; usually, generally, on the whole.
adverb.
To the greatest extent; most.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adverb.
in large part; mainly or chiefly
adverb.
usually; as a rule
Word Usage
"Partly because that's the establishment that babysits the Rams every week … but mostly because their playoff picture is * mostly* set. this week it's all about the AFC."