there-fore
[th air-fawr, -fohr]
adverb
1. in consequence of that; as a result; consequently:
I think; therefore I am.



British Dictionary
therefore
sentence connector
1. thus; hence: used to mark an inference on the speaker's part: those people have their umbrellas up: therefore, it must be raining
2. consequently; as a result: they heard the warning on the radio and therefore took another route