Lexical Definition

‎ἑκουσίως‎ hekousíōs (hek-oo-see'-ose) voluntarily G:ADV / G:A
adverb from the same as ‎ἑκούσιον‎

wilfully, willingly.

Usage: 2 forms in 4 verses
Form Translated As     In Verse(s)
Ἑκουσίωσ willingly Heb.10.261Pet.5.2
εκουσίωσ voluntarily LXX.Exod.36.2LXX.Ps.54.6

Abbott-Smith

ἑκουσίως adv., [in LXX: Ps 54:6* (נְדָבָה) II Mac 14:3, al. ;]
voluntarily, willingly: He 10:26, I Pe 5:2.†

Abbott-Smith References

Book Refs
Psalms 54:6*
Hebrews 10:26
1 Peter 5:2

Liddell-Scott-Jones

Included with: ἑκουσίως-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 . 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+]