Longman Dictionary of Contemporary English homepage

Date: 1100-1200
Origin: there + for

therefore

 adverb
     
there‧fore S2 W1 formal
as a result of something that has just been mentioned:
Their car was bigger and therefore more comfortable.
Progress so far has been very good. We are, therefore, confident that the work will be completed on time.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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