画かっ期き

noun

epoch-making; transition between eras

Refers to a major turning point that marks the beginning of a new era. Often used in the compound 画期的 (かっきてき, 'epoch-making'). As a standalone noun, it is somewhat literary.

See also: 画期的

• この発はつ明めいは科か学がくの画かっ期きをなすものだ。

  This invention marks an epoch in science.

• 明めい治じ維い新しんは日本にほんの歴れき史しにおける大おおきな画かっ期きだった。

  The Meiji Restoration was a major turning point in Japanese history.