Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. arcessītus, a, um, Part. of arcesso.
2. arcessītus, ūs, m. [arcesso], a calling, summons (very rare; only in abl. sing.): tuo arcessitu venio huc, Plaut. Stich. 2, 3, 3: cum ad eum ipsius rogatu arcessituque venissem, * Cic. N. D. 1, 6, 15; Amm. 31, 10.