The difference between Predominantly and Principally
When used as adverbs, predominantly means in a predominant manner. most commonly or frequently by a large margin, whereas principally means in a primary manner.
check bellow for the other definitions of Predominantly and Principally
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Predominantly as an adverb:
In a predominant manner. Most commonly or frequently by a large margin.
Examples:
"The membership is predominantly elderly, 90% are over age 60."
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Principally as an adverb:
In a primary manner; pertaining to the principal of a matter.