1The process by which a body, ability, society, or technology grows and advances to a more developed stage — often used as 発達する ('to develop').
赤ちゃんの脳は生後すぐに急速に発達する。
A baby's brain develops rapidly right after birth.
インターネットの発達で、遠くの人ともすぐに連絡が取れるようになった。
With the development of the internet, it has become possible to instantly contact people far away.
この地域は交通機関が発達しているので、車がなくても不便を感じない。
This area has well-developed transportation, so you don't feel inconvenienced even without a car.