different between collectively vs generally

English

collective +? -ly

collectively (not comparable)

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.

From Middle English generally, generalliche, equivalent to general +? -ly.

generally (comparative more generally, superlative most generally)

Popularly or widely.
As a rule; usually.
- 1661, John Fell, The Life of the most learned, reverend and pious Dr. H. Hammond
  During the whole time of his abode in the university he generally spent thirteen hours of the day in study; by which assiduity besides an exact dispatch of the whole course of philosophy, he read over in a manner all classic authors that are extant […]
Without reference to specific details.
(obsolete) Collectively; as a whole; without omissions.
- I counsel that all Israel be generally gathered unto thee.

(popularly or widely): commonly
(as a rule; usually): basically, by and large, commonly, ordinarily, mostly, regularly, wontedly; see also Thesaurus:mostly or Thesaurus:usually or Thesaurus:normally
(without reference to specific details): generically; see also Thesaurus:generally
(collectively): collaboratively, en masse; see also Thesaurus:jointly

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