While there is no ICANN policy that defines "community," as it relates to a Community gTLD, this type of top-level domain generally is operated to benefit a specific group of people who share an identity, interest, purpose, or other common denominator (e.g., cultural or linguistic group, regional community, professional organization, etc.).
An applicant that designates its applied-for string as a Community gTLD is required to have a Specification 12 in the applicable Registry Agreement with ICANN.