'Sporadic' definitions:

Definition of 'sporadic'

(from WordNet)
adjective
Recurring in scattered and irregular or unpredictable instances; "a city subjected to sporadic bombing raids" [ant: continual]

Definition of 'Sporadic'

From: GCIDE
  • Sporadic \Spo*rad"ic\ (-r[a^]d"[i^]k), a. [Gr. ? scattered, fr. ?, ?, scattered, fr. ? to sow seed, to scatter like seed: cf. F. sporadique. See Spore.] Occurring singly, or apart from other things of the same kind, or in scattered instances; separate; single; as, a sporadic fireball; a sporadic case of disease; a sporadic example of a flower. [1913 Webster]
  • Sporadic disease (Med.), a disease which occurs in single and scattered cases. See the Note under Endemic, a. [1913 Webster]

Synonyms of 'sporadic'

From: Moby Thesaurus