Definition from Wiktionary, the free dictionary
mostly (not comparable)
- Mainly or chiefly; for the most part; usually, generally, on the whole.
- They're mostly good people, although they have made a few mistakes.
2013 June 29, “A punch in the gut”, The Economist, volume 407, number 8842, page 72-3:
- Mostly, the microbiome is beneficial. It helps with digestion and enables people to extract a lot more calories from their food than would otherwise be possible. Research over the past few years, however, has implicated it in diseases from atherosclerosis to asthma to autism.
- (obsolete) To the greatest extent; most.
for the most part