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Hence (adverb) from here, from this place, away “I’m going hence, because you have insulted me.” “Get thee hence, Satan!” 
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Hence (adverb) from the living or from this world “After a long battle, my poor daughter was taken hence.” 
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Hence (adverb) in the future from now “A year hence it will be forgotten.” 
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Hence (adverb) as a result; therefore, for this reason “I shall go to Japan and hence will not be here in time for the party.” “The purse is handmade and hence very expensive.” 
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Hence (interjection) Go away! Begone! “”…Hence! and bestow your dead” “Where no wrong against him cries!”” 
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Since (adverb) From a specified time in the past. “I met him last year, but haven’t seen him since.” 
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Since (preposition) From: referring to a period of time ending in the present and defining it by the point in time at which it started, or the period in which its starting point occurred. 
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Since (preposition) Continuously during that period of time. “I have known her since last year.” 
 
					