noun-modifying (irregular)
septennial; recurring every seven years
Used attributively to describe plans, events, or periods that occur or last for seven years. Common in official contexts like 七カ年計画 (seven-year plan).
The government announced a new seven-year plan.
The results of this septennial survey have been compiled.
Commonly used in official documents and statistics. The カ is a counter marker.
Alternative spelling with small ヶ, also common.
Using Arabic numeral 7, common in tables and headlines.
Formal kanji spelling with 箇, less common in modern usage.
Variant with katakana ヵ.
Hiragana か variant, less common.
Variant with large ケ, sometimes seen.
Arabic numeral with small ヶ.
Arabic numeral with katakana ヵ.
Arabic numeral with hiragana か.
Arabic numeral with large ケ.
Compound of 七 (seven) + カ年 (counter for years). The カ is a counter marker derived from 箇, a classical counter word. The reading ななかねん uses the native Japanese number reading.