Толковый словарь английского языка - since

I. adverb Etymology: Middle English sins, contraction of sithens, from sithen, from Old English siththan, from sīth tham after that, from sīth after, late + tham, dative of thæt that; akin to Old High German sīd later and perhaps to Latin setius to a lesser degree Date: 15th century from a definite past time until now , before the present time ; ago , after a time in the past ; subsequently , II. conjunction Date: 15th century at a time in the past after or later than , when, in view of the fact that ; because , III. preposition Date: circa 1530 in the period after a specified time in the past ; from a specified time in the past