Extended Strong's Greek Lexicon (Abbott-Smith based)
adoption (as son)
Usage: υἱοθεσία, -ας, ἡ (cf. the cl. phrases, υἱὸν τίθεσθαι, θετὸς υἱός), frequently in Inscr. (see Deiss., BS, 239), adoption of a son (or daughter); metaphorically, of God's relation established __(a) with Israel: Rom.9:4; __(b) with Christians: Rom.8:15, Gal.4:5, Eph.1:5; of its consummation, Rom.8:23.† (AS)