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Since (adv.) From a definite past time until now; as, he went a month ago, and I have not seen him since.
Since (adv.) In the time past, counting backward from the present; before this or now; ago.
Since (adv.) When or that.
Since (prep.) From the time of; in or during the time subsequent to; subsequently to; after; -- usually with a past event or time for the object.
Since (conj.) Seeing that; because; considering; -- formerly followed by that.