noun, noun or participle which takes 'suru', intransitive verb
attendance at the Diet; going to the House
Specifically refers to a Diet member attending a session or going to the House. Used in political contexts.
議員は本会議に登院した。
The Diet member attended the plenary session.
彼は体調不良で登院できなかった。
He was unable to attend the House due to poor health.
noun, noun or participle which takes 'suru', intransitive verb
attendance at an academy; going to an institute
Used for attending an academy, institute, or similar institution, often in formal or academic contexts. Less common than the Diet sense.
研究生は毎日研究所に登院している。
The research student attends the institute every day.