Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sortĭo, īre, to draw lots (ante-class.; collat. form of sortior): tute sorti, Plaut. Cas. 2, 6, 43; 2, 6, 61: inter se sortiant, Varr. ap. Non. 471, 5.
With acc.: inter se sortiunt urbem atque agros, Enn. ap. Non. 471, 10 (Trag. v. 153 Vahl.).