connective N2 uncommon politewritten

のもとで — under

のもとで

Meaning

under ~ — under the supervision, guidance, or governing conditions of the named person or circumstance

有名ゆうめいな教授きょうじゅのもとで研究けんきゅうしている。

I'm doing research under a famous professor.

Attaches to	Form	Example
Noun	N + のもとで	先生せんせいのもとで / 厳きびしい規則きそくのもとで

厳きびしい規則きそくのもとで生活せいかつした。

I lived under strict rules.

専門家せんもんかの指導しどうのもとで訓練くんれんを受うけた。

I trained under the guidance of a specialist.

もと here is 元もと/下もと 'base, under'. The variant のもとに (with に) gathers things together under one banner or principle — 一ひとつの目標もくひょうのもとに集あつまる 'gather under a single goal' — while のもとで frames the situation in which an action takes place.

Jengo shows のもとで the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Sources Compiled with reference to A Dictionary of Intermediate Japanese Grammar.