τήρησις

εως, ἡ
A. watching, safe-keeping, guarding, ἀφύλακτος ἡ τ. E. Fr. 162; τῆς πολιτείας Arist. Pol. 1308a30, cf. PA 692a7; τῆς πόλεως Supp.Epigr. 6.724 (Perga, ii/i B.C.); τῆς οἰκίας POxy. 1070.51 (iii A.D.); ἀξιώματος Pl. Def. 413e; τῆς ἡλικίας Epicur. Sent.Vat. 80; [πλούτου] Phld. Oec. p.44J.; preservation, e.g. of health, Gal. 10.646, Pap. in Stud.Ital. 12(1935).94 (iii A.D.); observance, νόμων, ἐντολῶν, LXX Wi. 6.18(19), 1 Ep.Cor. 7.19; λεξάντων πρὸς τὴν τήρησιν τοῦ ὕδατος SIG 683.60 (Olympia, ii B.C.).
2. vigilance, Th. 7.13, Plb. 6.11A. 10.
3. means of keeping or guarding, τὰς λιθοτομίας . . , ἀσφαλεστάτην τ. the quarries . . , the most secure place of custody, Th. 7.86, cf. Act.Ap. 4.3, BGU 388 iii 7 (ii A.D.).
II. observing, observation, τῶν καθόλου συμβαινόντων (as Empiric term) Sor. 1.4, cf. Gal. 15.830, 16.550, 18(2).307, Sect.Intr. 4, S.E. P. 1.23, 2.246, A.D. Synt. 37.14, etc.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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