I.swiftness, speed, fleetness, velocity, Il., Plat.
II.τάχος is often used in Adverbial phrases for ταχέως, absol. in acc., Aesch., etc.: —with Preps., ἀπὸ τάχους Xen.; διὰ τάχους Soph., etc.; ἐν τάχει Aesch., etc.; εἰς τάχος Xen., etc.; κατὰ τάχος Hdt., Thuc.; μετὰ τάχους Plat.; σὺν τάχει Soph.:—also with relatives, ὡς τάχος, like ὡς τάχιστα, Hdt., Aesch.; so, ὅ τι τάχος Hdt., Soph.; ὅσον τάχος Soph.:—also, ὡς τάχεος εἶχεν ἕκαστος as each was off for speed, i. e. as quickly as they could, Hdt.; ὡς εἶχον τάχους Thuc.