ἑκουσιάζομαι
From LSJ
ἤκουσεν ἐν Ῥώμῃ καὶ ἀρσένων ἑταιρίαν εἶναι → he heard that there was also a fellowship of males in Rome (Severius, commentary on Romans 1:27)
English (LSJ)
A offer or be offered freely, ἐν τῷ ἑκουσιασθῆναι λαόν LXX Jd.5.2 ; ὁ -όμενος τῷ νόμῳ ib.IMa.2.42.
German (Pape)
[Seite 770] freiwillig Etwas thun, LXX.