ἐγγύησις
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)
εως, ἡ,
A security, CIG2953 b38 (Delos(?)), BGU981.36 (i A.D.), v.l. in D.24.73; right of giving security, IG22.10. II betrothal, Is.3.53; κατ' ἐγγύησιν Alciphr.3.1.