υἱοθετέω
From LSJ
ψυχῆς πείρατα ἰὼν οὐκ ἂν ἐξεύροιο πᾶσαν ἐπιπορευόμενος ὁδόν· οὕτω βαθὺν λόγον ἔχει → one would never discover the limits of soul, should one traverse every road—so deep a measure does it possess
English (LSJ)
A adopt as a son, PLips.28.22 (iv A. D.), Cat. Cod.Astr.6.68 (both Pass.).
German (Pape)
[Seite 1176] zum Sohne annehmen, adoptiren, N. T. u. a. Sp.