Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
obtĭcentĭa, ae, f. [obticeo], a pause, sudden break in the midst of a discourse, as a rhet. figure: Ἀποσιώπησις, quam Cicero reticentiam, Celsus obticentiam, nonnulli interruptionem appellant, Quint. 9, 2, 54.