expression, godan verb (-ru, irregular)
not uncommon; happen fairly often; occur with some frequency
Used to describe situations or events that are not rare; implies a moderate frequency, not extremely common. Often appears in explanatory or descriptive contexts.
この地域では、夏に雷雨がままある。
In this region, thunderstorms are not uncommon in summer.
初心者には、そういうミスがままあることだ。
It's not uncommon for beginners to make that kind of mistake.