The difference between Collectively and En masse
When used as adverbs, collectively means in a collective manner, whereas en masse means in a single body or group.
check bellow for the other definitions of Collectively and En masse
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Collectively as an adverb:
in a collective manner; viewed together as a whole; to be treated as a single unit, rather than the items that make up the collection separately.
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En masse as an adverb:
in a single body or group; as one; together