εἰσοικειόω
From LSJ
Περὶ τοῦ ἐπέκεινα τοῦ νοῦ κατὰ μὲν νόησιν πολλὰ λέγεται, θεωρεῖται δὲ ἀνοησίᾳ κρείττονι νοήσεως → On the subject of that which is beyond intellect, many statements are made on the basis of intellection, but it may be immediately cognised only by means of a non-intellection superior to intellection
English (LSJ)
A bring in as a friend, τινὰ γάμοις Plu.Alex.10 :—Pass., become intimate with, X.HG5.2.25.
German (Pape)
[Seite 744] zum Freunde machen; pass., Xen. Hell. 5, 2, 25; γάμοις Plut. Alex. 10.