Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
āvŏcātĭo, ōnis, f. [avoco], a calling off from a thing, a diverting of the attention, diversion, interruption (very rare): avocatio a cogitandā molestiā, * Cic. Tusc. 3, 15, 33: In his, quae me sine avocatione circumstrepunt, etc., Sen. Ep. 56, 4.