adverb
as a consequence; therefore
preposition
from this place; away
conjunction
as a result; therefore
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The data clearly shows a correlation between smoking and lung cancer, hence the need for more research in this area.
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I missed the bus, hence why I'm running late to the meeting.
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I aced the exam, hence I'm feeling pretty good about my grade in the class.
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His dedication to his craft is unmatched, hence why he is considered a master in his field.