What is the meaning of Columbarium?

A large, sometimes architecturally impressive building for housing a large colony of pigeons or doves, particularly those of ancien regime France.

A pigeonhole in such a dovecote.

A building, a vault or a similar place for the respectful and usually public storage of cinerary urns containing cremated remains.

A niche in such a building for housing urns.

vault for funerary urns, columbarium

dovecote, columbarium

columbarium

dovecote, birdhouse for domestic pigeons

a hole for a horizontal member such as a joist or rafter; a gain or mortise

a hole in the side of a waterwheel near its axle, where the water lifted by the wheel exits

an opening for oars in the side of a vessel; an oarlock

an underground chamber for interring cremated remains, with niches for the urns of ashes

Source: wiktionary.org