quasi (adv.)youdaoicibaDictYouDict[quasi 词源字典]
late 15c., Latin, in hypothetical comparisons, "as if, just as if, as though;" in real comparisons "just as, as;" in approximation, "somewhat like, nearly, not far from;" from quam "as" relative pronominal adverb of manner (see who) + si "if," from PIE pronominal stem *swo- "so" (see so).[quasi etymology, quasi origin, 英语词源]