The difference between In the main and Mostly
In the main is also phrase with the meaning: principally.
Mostly is also adverb with the meaning: mainly or chiefly.
check bellow for the other definitions of In the main and Mostly
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Mostly as an adverb:
Mainly or chiefly; for the most part; usually, generally, on the whole.
Examples:
"They're mostly good people, although they have made a few mistakes."
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Mostly as an adverb (obsolete):
To the greatest extent; most.