From an unused root apparently meaning to dwell together; sexual (cohabitation) -- duty of marriage.
H5772. ownah
[עוֺנָה] Qr, [ עֵינָה] Kt noun feminine only suffix Hosea 10:10: Qr plural עוֺנֹתָם Baer, singular עוֺנָתָם Ginsb; > עֵינֹתָם Kt; but read עֲוֺנֹתָם, see עָוֺן 1a..
[עֹנָה] noun feminine cohabitation (Late Hebrew עוֺנָה time, also = Biblical Hebrew; possibly response or correspondence, commerce, from above √; or else euphemistic, specific time, SS (compare BaES 17, from √ ); Thes from עון dwell); — suffix עֹנָתָהּ Exodus 21:10 (E) i.e. her marriage rights. — Hosea 10:10 see עָוֺן