Meaning and Usage
The suffix ～期 (～き) is used to indicate a specific period or phase in time, often related to age, development, or stages of a process. It can refer to biological stages (like growth periods), historical eras, or phases in projects or life events.
Common Contexts
You will often see ～期 used in contexts such as growth periods (成長期), preparation periods (準備期), or historical periods (時代区分). It is a formal and neutral term, suitable for both spoken and written Japanese.
Collocations and Patterns
- 成長期 (せいちょうき): growth period, often used for children or plants.
- 創業期 (そうぎょうき): founding or startup period of a company.
- 準備期 (じゅんびき): preparation period before an event or exam.
- 更年期 (こうねんき): menopause period.
Nuances and Tips
When using ～期, it usually attaches to nouns that denote a stage or time frame. It is not used for very short moments but rather for extended periods. Learners sometimes confuse ～期 with ～時 (じ) which means 'time' or 'hour'; ～期 emphasizes a phase or period rather than a specific point in time.
Formality
～期 is a formal suffix and is common in academic, medical, business, and historical contexts. It is less common in casual conversation unless discussing specific periods or stages.