The difference between Mostly and Principally
When used as adverbs, mostly means mainly or chiefly, whereas principally means in a primary manner.
check bellow for the other definitions of Mostly and Principally
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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.
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Principally as an adverb:
In a primary manner; pertaining to the principal of a matter.