say it: MOHST-lee
mostly is an adverb meaning "in large part; mainly or chiefly". It carries 2 recorded senses.
in large part; mainly or chiefly
“These accounts are largely inactive”
usually; as a rule
“by and large it doesn't rain much here”
Definitions, synonyms and semantic relations for mostly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.