Quick Definition
ἑκούσιος, ία, ιον Adj willing, voluntary, spontaneous
Strong's Definition
neuter of a derivative from 1635; voluntariness
KJV Usage: willingly
UBS Dictionary of the Greek New Testament
adjc. | -α, -ον | ἑκών
25.65 · Attitudes and Emotions · Be Willing
willing, willingly, of one’s own free will pertaining to being willing to do something without being forced or pressured In a number of languages ‘willingness’ to perform some action is expressed negatively, for example, ‘not having to’ or ‘not being forced to’ or ‘not being told one must.’ A positive expression of ‘willingness’ may be indicated idiomatically by a phrase such as ‘my heart approves.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ἑκούσιος, -ov, (ἑκών ), voluntary: κατὰ ἑκούσιον, of free will, Philem. 14. (Num. xv. 3; καθ᾽ ἑκουσίαν, Thue. 8, 27—[“ The word understood in the one case appears to be τρόπον (Porphyr. de abst. 1, 9 καθ᾽ ἑκούσιον τρόπον, comp. Eur. Med. 751 ἑκουσίῳ τρόπῳ) ; inthe other, γνώμην so ἑκουσίᾳ (doubtful, see L. and S.], ἐξ ἑκουσίας, ete. ;” ef. Lobeck, Phryn. p. 4; Bp. Lghtft. on Philem. l.c.; ef. W. 463 (432)].)
Mounce Concise Greek Dictionary
ἑκούσιος hekousios 1x
voluntary, spontaneous, Phlm. 14*
Abbott-Smith Greek Lexicon
ἐκούσιος, -ον
(< έκών), [in LXX chiefly for נְדָבָה, as Nu 15:3 (κατ’ ἑ.);]
usually of actions, voluntary: κατὰ ἑ., of free will (Lft., in l), Phm 14.†
Liddell-Scott-Jones — Greek-English Lexicon
ἑκούσιος (hekousios) — voluntary. ἑκούσι-ος, α, ον [Refs 5th c.BC+]; also ος, ον [Refs 5th c.BC+]: (ἑκών):—of actions, voluntary, πόνοι [Refs 5th c.BC+][same place]; φυγή E.[same place]; ἁμάρτημα [Refs 5th c.BC+]; ἀδικήματα [Refs]undertaken voluntarily, [Refs 2nd c.AD+]; τὰ ἑ. voluntary acts, opposed to τὰ ἀκούσια, [Refs 5th c.BC+]
2. rarely of persons, willing, acting of free will, ἥμαρτεν οὐχ ἑκουσία [Refs 5th c.BC+]
II. adverb -ίως[Refs 5th c.BC+]; ἐξ ἑκουσίας (i.e. γνώμης) [Refs 5th c.BC+]