Therefore is defined as because something happened.
(adverb)An example of therefore is saying that you got a cold and then had to stay home from work.
See therefore in Webster's New World College Dictionary
adverb
Origin: ME ther fore: see there & fore
as a result of this or that; for this or that reason; consequently; hence: often used as a conjunctive adverbSee therefore in American Heritage Dictionary 4
adverb
Origin:
Origin: Middle English
Origin: : there, there; see there
Origin: + for, fore, fore; see for
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