Definition of therefore adverb from the Oxford Advanced American Dictionary

  

therefore

 adverb
adverb
NAmE//ˈðɛrfɔr//
 
 
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 used to introduce the logical result of something that has just been mentioned He's only 17 and therefore not eligible to vote. There is still much to discuss. We shall, therefore, return to this item at our next meeting. Language Bankthereforeways of saying “for this reason…” Children who grow up on a diet of junk food find it difficult to change this habit later in life. It is essential, therefore, that parents encourage healthy eating from an early age. Children who grow up on a diet of junk food find it difficult to change this habit later in life. For this reason, /This is why it is essential that children eat healthily from an early age. Eating habits formed in childhood tend to continue into adult life. Thus, the best way to prevent heart disease among adults is to encourage healthy eating from an early age. Eating habits formed in childhood tend to continue into adult life, hence the importance of encouraging healthy eating from an early age.
See the Oxford Advanced Learner's Dictionary entry: therefore