The difference between By and large and Largely
When used as adverbs, by and large means mostly, generally, whereas largely means in a widespread or large manner.
check bellow for the other definitions of By and large and Largely
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By and large as an adverb (set phrase, focus):
mostly, generally; with few exceptions
Examples:
"It was, by and large, an unexceptional presentation."
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Largely as an adverb:
In a widespread or large manner.
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Largely as an adverb:
For the most part; mainly or chiefly.
Examples:
"They were largely successful in their efforts."
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Largely as an adverb:
On a large scale; amply.
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Largely as an adverb (obsolete):
Fully, at great length.