The difference between By and large and Primarily
When used as adverbs, by and large means mostly, generally, whereas primarily means of a primary or central nature, first and foremost.
check bellow for the other definitions of By and large and Primarily
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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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Primarily as an adverb (focus):
Of a primary or central nature, first and foremost