also: いちてんき
Refers to a decisive moment or event that changes the course of a situation, similar to 転機 but with a slightly more formal or literary feel.
That event became a turning point in his life.
This discovery can be called a turning point in the history of science.
Standard kanji spelling; the reading いってんき is the most common.
Alternate reading; less common than いってんき.
Compound of 一 (one) and 転機 (turning point), literally 'one turning point'. The exact historical derivation is uncertain, but it likely emphasizes a single, decisive change.