Usage: 6 forms in 36 verses
Form Translated As     In Verse(s)
κτησέωσ property LXX.1Chr.28.1
κτήσισ a possession LXX.Eccl.2.7
possession LXX.Job.36.33
property LXX.Prov.8.18 • LXX.Prov.10.15
κτήσιν a possession LXX.Gen.23.4 • LXX.Gen.23.9 • LXX.Gen.23.18 • LXX.Gen.23.20 • LXX.Jer.32.7
his possession LXX.Lev.25.10 • LXX.Lev.25.13 • LXX.Lev.25.16
of his possession LXX.Lev.25.16
property LXX.Gen.46.6 • LXX.Judg.18.21 • LXX.Prov.1.13 • LXX.Ezek.38.13
κτήσεωσ his possessions LXX.Ps.105.21
of their property LXX.Gen.36.43
of this possession LXX.Jer.32.14
possession LXX.Jer.32.11 • LXX.Jer.32.12 • LXX.Jer.32.16
κτήσεισ our possessions LXX.Num.32.26
possessions LXX.2Chr.32.29 • LXX.Ezek.38.12
their possessions LXX.1Chr.5.21
your possessions LXX.2Kgs.3.17
κτήσει a possession LXX.Gen.50.13 • LXX.Lev.14.34 • LXX.Lev.20.24
a property LXX.Gen.49.32
of your possessing LXX.Prov.4.7
our property LXX.Ezra.8.21
possession LXX.Gen.49.30

Liddell-Scott-Jones

κτῆσις (ktēsis) a possession G:N-F

κτῆσις, εως, ἡ,

(κτάομαι) acquisition (opposed to ἀπόλαυσις, [Refs 5th c.BC+]; κατ᾽ ἔργου κτῆσιν according to success in the work, [Refs 5th c.BC+]

__II (from perfect) possession, λέχους, πλούτου, etc.,[Refs 5th c.BC+]; διὰ τὴν τῶν υἱέων κ. on account of your having sons, [Refs 4th c.BC+]; κ. ἐκ δεσπότου καὶ δούλου [συνέστηκεν] [Refs 4th c.BC+]; holding, opposed to χρῆσις ('using'), [Refs]; ownership, opposed to χρῆσις ('usufruct'), [Refs 2nd c.BC+]
__II.2 as collective, ={κτήματα}, possessions, property, διὰ κτῆσιν δατέοντο [Refs 8th c.BC+]; especially lands, farms, [Refs 1st c.BC+]: also in singular, farm, estate, [Refs 3rd c.AD+]