διατήρησις
From LSJ
Ἄξιόν ἐστι τὸ ἀρνίον τὸ ἐσφαγμένον λαβεῖν τὴν δύναμιν καὶ τὸν πλοῦτον καὶ σοφίαν καὶ ἰσχὺν καὶ τιμὴν καὶ δόξαν καὶ εὐλογίαν → Worthy is the Lamb that was slain to receive power, and riches, and wisdom, and strength, and honour, and glory, and blessing
English (LSJ)
εως, ἡ,
A preservation, LXX Ex.16.33,al.; ἑαυτῶν D.S.2.50; τῶν ἁγίων Ph. 1.203; γένους J.AJ1.3.2, etc.