1. under (guidance, supervision, rules, the law, etc.)
oft. のもとに or のもとで
2. under (a flag, the sun, etc.); beneath
3. with (e.g. one blow); on (the promise, condition, assumption, etc. that ...); in (e.g. the name of)
as ...のもとに
4. (somebody's) side; (somebody's) location
usu. written 元