Meaning of CLOSED in English

CLOSED

adjective Date: 13th century 1. not open, en~, composed entirely of ~ tubes or vessels , 2. forming a self-contained unit allowing no additions , b. traced by a moving point that returns to an arbitrary starting point , characterized by mathematical elements that when subjected to an operation produce only elements of the same set , containing all the limit points of every possible subset , characterized by continuous return and reuse of the working substance , having the same starting and finishing point, 3. confined to a few , excluding participation of outsiders or witnesses ; conducted in strict secrecy, rigidly excluding outside influence , ending in a consonant

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.