different between largely vs extensively

English

large +? -ly

enPR: lärj?-li, IPA^(key): /?l??d?li/
- (General Australian) IPA^(key): [?la?d?.li]
- (UK) IPA^(key): [?l??d?.li]
- (US) IPA^(key): [?l??d?.li]
Hyphenation: large?ly

largely (comparative largelier or more largely, superlative largeliest or most largely)

In a widespread or large manner.
For the most part; mainly or chiefly.
On a large scale; amply.
- 1913, D.H. Lawrence, Sons and Lovers, chapter 2
  Usually there was a jug of one or other decoction standing on the hob, from which he drank largely.
  "Grand!" he said, smacking his lips after wormwood. "Grand!" And he exhorted the children to try.
(obsolete) Fully, at great length.
- 1590, Edmund Spenser, The Faerie Queene, III.ii:
  It ill beseemes a knight of gentle sort, / Such as ye haue him boasted, to beguile / A simple mayd, and worke so haynous tort, / In shame of knighthood, as I largely can report.

(in a large manner):
(for the most part): by and large, for the most part, in the main; see also Thesaurus:mostly
(on a large scale): abundantly, fully, plentifully
(at great length): at length

extensive +? -ly.

extensively (comparative more extensively, superlative most extensively)

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