also: いっしじん
noun
private individual
Refers to a person acting in their personal capacity, not as a public figure or official.
彼は一私人として発言した。
He spoke as a private individual.
一私人の立場から意見を述べる。
I express my opinion from the standpoint of a private individual.
私人 also means 'private individual', but 一私人 emphasizes the singular, individual aspect more strongly.
Compound of 一 (one) and 私人 (private individual). The reading いちしじん follows standard on'yomi, while いっしじん is an assimilated variant.