As opposed to a "privileged", a "root" or an "admin" account, a limited account cannot access some potentially destructive features of a given system, such as installing/removing software (or plugins), or changing system-wide configurations.
In the context of operating system users:
A limited account has basic permissions on a computer, which allows to do basic things for day-to-day use, such as sending emails, writing documents, and browsing the internet. [1]