κάθεξις · kathexis — LSJ
holding, retention, τῆς ἀρχῆς Th. 3.47; ἐν μνήμῃ καὶ καθέξει Plu. Sollert. 2.968c; possession, Plot. 6.1.23.
holding in, restraining, τοῦ πνεύματος Arist. Somn.Vig. 456a16; [θυμοῦ] Id. EE 1223b20.
retentive power, of the bladder, Aret. CA 1.4.