Tra từ occasional - Từ điển Oxford Advanced Learner 8th

oc·ca·sion·al BrE [əˈkeɪʒənl] NAmE [əˈkeɪʒənl] adjective only before noun
happening or done sometimes but not often
•He works for us on an occasional basis.
•I enjoy the occasional glass of wine.
•He spent five years in Paris, with occasional visits to Italy.
•an occasional smoker (= a person who smokes, but not often)

Thesaurus:
occasional [occasional] adj. only before noun
•Occasional gunshots could still be heard.
intermittent • |written sporadic • |especially spoken the odd… •
Opp: regular, Opp: frequent
occasional/intermittent/sporadic contact/attacks/bursts of sth
on an occasional/intermittent/sporadic basis
the occasional/odd bit/bout/spot of sth

Example Bank:
•I still smoke the occasional cigarette.
•Occasional gunshots could still be heard.
•Regular light exercise is safer than occasional bouts of strenuous activity.
•She found occasional work on television.
•The article is the fourth in our occasional series on young Welsh writers.
•The firm survived with a staff of four, plus occasional help from the owner's wife.
•They can easily be persuaded to help, at least on an occasional basis.
•They meet for the occasional cup of coffee.
•You have to expect a few difficulties and the occasional setback.