An adverb meaning comparatively/relatively; indicates that something is more/less than expected — similar to 'fairly' or 'quite'.
今日は割と暖かいですね。
It's relatively warm today, isn't it?
彼の日本語は割と上手だと思う。
I think his Japanese is fairly good.
この店は割と安くて使いやすい。
This shop is relatively cheap and convenient to use.