Etymology
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sporadic (adj.)

1680s, from Medieval Latin sporadicus "scattered," from Greek sporadikos "scattered," from sporas (genitive sporados) "scattered, dispersed," from spora "a sowing" (see spore). Originally a medical term, "occurring in scattered instances;" the meaning "happening at intervals" is first recorded 1847. Related: Sporadical (1650s); sporadically.

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Definitions of sporadic

sporadic (adj.)
recurring in scattered and irregular or unpredictable instances;
a city subjected to sporadic bombing raids
From wordnet.princeton.edu