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I think the more pressing matter is why would someone need to look up the definition of 'thru'?

If your thinking is so narrow that you'd assume the only reason a person would look up a word is because they don't know the definition, then I really am wasting my time with you. Have a good life at least until your kind exterminate themselves.

I didn't realize that asking a question would offend you so much. My apologies.