Noun
Verb (する, intransitive)
1. development; growth
人間の心の発達は、実際はそこまで単純じゃない。The development of the human mind is not actually that simple.
2. progress; development; advancement
さすがにこの国の文化は発達しているな。As expected, the culture of this country is advanced.
3. expansion (of a typhoon, low-pressure area, etc.)
発達した前線が通過してるからだ。It's because a strong front is passing through.
4. developmental disability; person with a developmental disability