に伴ともなって

Meanings

Indicates that one change or event happens in parallel with another, often implying a cause-and-effect or proportional relationship. Used in formal and written contexts.

年としを取とるに伴ともなって、体たい力りょくが落おちてきた。
As I get older, my physical strength has declined.
経けい済ざい成せい長ちょうに伴ともなって、環かん境きょう問もん題だいも深しん刻こく化かしている。
Along with economic growth, environmental problems are also becoming more serious.

Grammar

に伴ともなって・に伴ともないalong with; as a consequence ofN2

Kanji

伴consort, accompany, bring with

Related words

とともに
に伴って highlights a consequential or accompanying change in a formal context, whereas と共に more broadly covers accompaniment or simultaneity.
に従したがって
に伴って and に従って both describe a change happening as another change occurs, but に伴って emphasizes a stronger, often inevitable or large-scale accompanying relationship, while に従って is more neutral and works well for gradual or proportional change.
につれ
に伴って describes one event or change accompanying another (not always gradual), while に連れ specifically emphasizes proportional, step-by-step change.

Etymology

Formed from the particle に and the て-form of the verb 伴う (ともなう, 'to accompany'). Literally 'accompanying', it grammaticalized into a conjunction meaning 'as' or 'along with'.