1. ( in full the Young Men’s Christian Association ) a Christian organization that offers a wide range of religious, educational, sports and social activities to young men of all races, religions and social backgrounds. It was established in Britain in 1844 and now operates in many countries around the world. It is known especially for its hostels (= places offering cheap food and accommodation).
2. n a building owned and run by the YMCA:
I stayed in a YMCA in London for two weeks.
See also Y .