also: エポックメーキング
na-adjective
epoch-making; pivotal
Describes an event, discovery, or work that is so significant it marks the start of a new era. Often used in formal or journalistic contexts.
その発明はエポックメイキングな出来事だった。
That invention was an epoch-making event.
エポックメイキングな研究が発表された。
An epoch-making study was published.
画期的 is the native Japanese equivalent and is more common in everyday speech. エポックメイキング carries a slightly more formal or academic tone.
Loanword from English 'epoch-making'.