nudism
Refers to the practice or philosophy of nudism, often in a social or lifestyle context. Compare with ヌーディズム, a more direct loanword.
See also: ヌーディズム
He visited a nudist beach to practice nudism.
A direct loanword from English 'nudism', often used interchangeably but may sound more modern or Western-oriented. 裸体主義 is the native Japanese compound.
Compound of 裸体 (らたい, 'naked body') and 主義 (しゅぎ, '-ism'), literally 'naked-body-ism'. The term is a straightforward Sino-Japanese construction.