Extended Strong's Greek Lexicon (Abbott-Smith based)
to seal
Usage: σφραγίζω [in LXX chiefly for חָתַם (Deu.32:34, al.), also for סָתַם (Da TH Dan.8:26) ;] to seal, __(a) for security: Mat.27:66, Rev.20:3; τ. καρπὸν τοῦτον, figuratively (cf. Deiss., BS, 238 f.; MM, xxiv; DB, iv, 427a), Rom.15:28; __(b) for concealment, hence, metaphorically, to hide (Da TH Dan.9:24, Jhn.14:17): Rev.10:4 22:10; __(with) for distinction, Rev.7:3-8; metaphorically, Eph.4:30; mid., 2Co.1:22; __(d) for authentication (Est.8:8): Jhn.3:33 6:27 (cf. κατα-σφραγίζω).† (AS)