a building in which objects of artistic, cultural, historical or scientific interest are kept and shown to the public. a museum of modern art ... The Guggenheim Museum · The Ashmolean Museum · The British Museum

a building in which objects of artistic, cultural, historical, or scientific interest are kept and shown to the public

There are four meanings listed in OED's entry for the noun museum, one of which is labelled obsolete, and one of which is considered derogatory.

​an object that is of enough historical or artistic value to have in a museum. The vase is a stunning museum piece from the 18th century.

a museum that displays interesting or historical objects that were part of the local people's everyday lives, such as clothes and tools.

a big museum in London, with displays about plants, animals, insects, fossils (= animals and plants preserved in rock) and minerals.

5 дней назад · a building where objects of historical, scientific, or artistic interest are kept: a museum of modern art, the Natural History Museum.

​a museum in Cardiff, with exhibitions of archaeology , nature, art, and industrial and social history, mainly, but not only, connected with Wales.

Museum (Μουσεῖον‎), originally a place connected with the Muses or the arts inspired by them. Euripides speaks of the μουσεῖα‎ of birds, the places where ...

the national museum of Britain, established in 1753. The main building is in Bloomsbury, London, and includes the famous reading room.