LSJ
ατος, τό, in Roman law, hereditary leasehold held on cultivating tenure, Just. Nov. 7.3.2; quitrent paid on such property, Cod.Just. 1.4.32, PMasp. 298.40 (vi AD).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
τό, ein in Erbpacht gegebenes Gut, Novell.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)