--description--

Occasionally means something happens now and then. It is not all the time, and not never, but somewhere in between. For example:

I occasionally get a bug in my code. - Sometimes there is a mistake in your code, but not very often.

Take a look at these adverbs, and the frequency they usually represent.

Adverb	Frequency	Adverb	Frequency
Never	0%	Often	70%
Rarely	5%	Generally	80%
Seldom	15%	Usually	90%
Occasionally	30%	Always	100%
Sometimes	50%

--questions--

Choose the word that has a similar meaning to occasionally.

frequently

Frequently means it happens often, which is more than occasionally.

rarely

Rarely means it almost never happens, which is less than occasionally.

sometimes

always

Always means it happens every time, which is not similar to occasionally.