IPA: /əˈkeɪʒənəli/
KK: /əˈkeɪʒənəli/
At certain times, but not regularly or often.
I occasionally go for a walk in the park on weekends.
Occasionally → It is formed from "occasion" (from Latin *occasio*, meaning a favorable opportunity) and the suffix "-ally" (meaning in a manner relating to). The word "occasionally" means in a manner relating to a favorable opportunity, or happening from time to time.
Think of 'occasion' as a special opportunity that happens 'in a manner' ('-ally') from time to time.