na-adjective, noun
very convenient; extremely handy
Emphasizes a high degree of convenience, often used in formal or written contexts. Can function as a noun or adjectival noun.
駅から徒歩2分で至便な立地です。
It's in a very convenient location, just a 2-minute walk from the station.
このアプリは操作が至便で、誰でもすぐに使えます。
This app is extremely easy to use; anyone can start using it right away.