What does 간 (Gan/Gun) mean? Is it the same as 시 간?

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I'm confused by what you mean. 
1. 간 = "liver"
2. Conjugated form of the verb "to go (가다)" 
3. for ~ length of time: "for 2 days" = "양일간"; "for several years" = "수년 간"
4. short for "relationship (관계)"
and many more meanings.

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No I don't have a sentence. I can't remember where I heard or read the word but I do understand what you're saying. Thank you for your help!!!!!!

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간 could mean an interval as in 시간.
context is very important to understand korean.
do you have a sentence?