G1616
ἐκτένεια
earnestness
ἐκ-τένεια, -ας, ἡ (ἐκτενής), [in LXX: Jdth.4:9, 2Ma.14:38, 3Ma.6:41 * ;] zeal, intentness, earnestness (cf. Deiss., BS, 262): Act.26:7.† (AS)
The KJV translates G1616 in the following manner:
instantly (2x)
Full Thayer's lexicon entry
ἐκτένεια — ekténeia
ἐκτένεια, ἐκτενειας, ἡ (ἐκτενής), a later Greek word (cf. Lob. ad Phryn., p. 311);
a. properly, extension.
b. intentness (of mind), earnestness: ἐν ἐκτένεια, earnestly, Act 26:7. (2Ma 14:38; Jdt 4:9. Cf. Grimm on 3Ma 6:41 (where he refers to Cicero, ad Att. 10, 17, 1).)
1 occurrence