1. (noun) a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings

• revolver

1. (noun) an organization or institution with a high rate of turnover of personnel or membership

• social group

2. (noun) a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings

• door