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 a museum of modern art a science ...

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.

A building used for the storing and exhibition of objects including antiquities, natural history, and works of art.

There is one meaning in OED's entry for the verb museum. See 'Meaning & use' for definition, usage, and quotation evidence.

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

​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 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.

Museum,. Source: The Oxford Dictionary of the Classical World. originally a place connected with the Muses or the arts inspired by them.