G2171
εὐχή
a vow/prayer
εὐχή, -ῆς, ἡ (εὔχομαι), [in LXX chiefly for נָדַר ;] __1. a prayer: Jas.5:15. __2. a vow: Act.18:18 21:23.† SYN.: see: δέησις (AS)
The KJV translates G2171 in the following manner:
vow (4x), prayer (2x)
Full Thayer's lexicon entry
εὐχή — euchḗ
εὐχή, εὐχῆς, ἡ (εὔχομαι (from Homer down);
1. a prayer to God: Jas 5:15.
2. a vow (often so in the Sept. for נֵדֶר and נֶדֶר, also for נֵזֶר consecration, see ἁγνίζω): εὐχήν ἔχειν, to have taken a vow, Act 18:18; with ἐφ' ἑαυτῶν added (see ἐπί, A. I. 1 f., p. 232a), Act 21:23.
3 occurrences
Acts (2), James (1)