в основном meaning in English

basically▼(in a fundamental or basic manner)
adverb
[UK: ˈbeɪ.sɪk.l̩i] [US: ˈbeɪ.sɪk.l̩i]

chiefly▼(mainly or principally, almost entirely)
adverb
[UK: ˈtʃiː.fli] [US: ˈtʃiː.fli]

for the most part▼(mostly)
adverb
[UK: fɔː(r) ðə məʊst pɑːt] [US: ˈfɔːr ðə moʊst ˈpɑːrt]

mainly▼(chiefly; for the most part)
adverb
[UK: ˈmeɪn.li] [US: ˈmeɪn.li]

mostly▼(for the most part)
adverb
[UK: ˈməʊst.li] [US: ˈmoʊst.li]