"mostly" in the adverb sense
1. largely, mostly, for the most part
in large part mainly or chiefly
"These accounts are largely inactive"
2. by and large, generally, more often than not, mostly
usually as a rule
"by and large it doesn't rain much here"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License