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(どあ)」は出(で)入(い)り口(ぐち)の開(かい)閉(へい)する部分(ぶぶん)です。英語(えいご)の「door」と同(おな)じ意味(いみ)で、部屋(へや)や建物(たてもの)の入(い)り口(ぐち)に使(つか)われます。