ドア (doa) is a loanword from English, referring to a movable barrier that allows ingress or egress to an enclosure, room, or building. It's directly equivalent to 'door' or 'gateway' in English, controlling access and providing privacy in various structures.

「ドア」は出入り口の開閉する部分です。英語の「door」と同じ意味で、部屋や建物の入り口に使われます。