The difference between Mainly and Principally
When used as adverbs, mainly means forcefully, vigorously, whereas principally means in a primary manner.
check bellow for the other definitions of Mainly and Principally
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Mainly as an adverb (obsolete):
Forcefully, vigorously.
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Mainly as an adverb (obsolete):
Of the production of a sound: loudly, powerfully.
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Mainly as an adverb (obsolete):
To a great degree; very much.
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Mainly as an adverb:
Chiefly; for the most part.
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Principally as an adverb:
In a primary manner; pertaining to the principal of a matter.