Definition of sporadic adjective from the Oxford Advanced Learner's Dictionary

 

sporadic

 adjective
adjective
BrE BrE//spəˈrædɪk//
 
; NAmE NAmE//spəˈrædɪk//
 
 
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happening only occasionally or at intervals that are not regular synonym intermittent sporadic fighting/gunfire/violence, etc. sporadic outbreaks of the disease Word Origin late 17th cent.: via medieval Latin from Greek sporadikos, from sporas, sporad- ‘scattered’; related to speirein ‘to sow’.Extra examples Sporadic fighting continued through the next day. Sporadic gunfire was reported each night. The findings are derived from sporadic and statistically unreliable surveys. There are sporadic outbreaks of violence.
See the Oxford Advanced American Dictionary entry: sporadic