Translation

転換期 / 重大な時期 / 更年期

Meaning

A climacteric is a critical turning point or difficult period of change in a life, institution, or historical process. It is formal and uncommon. The trap is confusing it with climactic, which means related to a climax, or climatic, which means related to climate.

Examples

• その改革は王国の歴史における重大な転換期を示しました。
  The reform marked a climacteric in the kingdom's history.
• その会社は創業者の退任後、難しい転換期を迎えました。
  The company entered a difficult climacteric after its founder retired.