also: プライマリ
noun-modifying (irregular)
Prenominal use, often in technical or formal contexts, modifying a noun to indicate the first or most important element.
プライマリーケアは地域医療の基本です。
Primary care is the foundation of community medicine.
このシステムのプライマリ機能はデータの保存です。
The primary function of this system is data storage.
noun
primary glider; basic training glider
Aviation term for a simple, unpowered aircraft used in initial flight training.
パイロット候補生はまずプライマリーで訓練を受ける。
Trainee pilots first receive training on a primary glider.
Borrowed from English 'primary'.