"Occasional use" means using something or doing something only from time to time, but not regularly or frequently.
Sentences with «occasional use»
You need to treat this more as a desktop replacement, with only occasional use of actually moving it to different locations — and hardly ever gaming on the go. (indianexpress.com)
I think it is a great sweetener for occasional use for those who have a hard time being completely deprived of dessert - like things. (elanaspantry.com)