Definition of occasionally adverb from the Oxford Advanced Learner's Dictionary

  

occasionally

 adverb
adverb
BrE BrE//əˈkeɪʒnəli//
 
; NAmE NAmE//əˈkeɪʒnəli//
 
 
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sometimes but not often We occasionally meet for a drink after work. This type of allergy can very occasionally be fatal. Only occasionally was there any doubt that they would succeed.Extra examples I tend to paint anything although only very occasionally a portrait. Occasionally, the problem is genetic. She often felt sick and occasionally vomited. The celebrations usually lasted a week but occasionally went on longer.
See the Oxford Advanced American Dictionary entry: occasionally