This is the 1373rd most frequent Japanese word.
上限
"上限" means "upper limit" or "maximum."
In this usage, 上限 conveys the absence of a maximum limitation placed on the service usage amount.
このサービスの使用量には上限がありません。
There is no limit on the usage of this service.
上限 is used to specify a maximum limit or cap for the number of course participants.
このコースの参加者数の上限は50人です。
The maximum number of participants for this course is 50.
上限 here refers to a set limit or boundary that aids in controlling or organizing a specific aspect, such as budget.