efficiency

変分法: calculus of variations

文房四宝: the four treasures of the study

立位: standing sex position

律雄, 律夫: a male given name

自律: autonomy / 自立: independence / 而立: age 30 / 侍立: assisting a dignitary

自立: be independent / 侍立: assist a dignitary

(Buddhism) Short for 律宗 (Risshū): the Risshū school of Buddhism / a female given name

a law, code

(music) a rhythm / (music) the six yang (odd-numbered) notes in the 十二律 (jūniritsu) chromatic scale / (music) Short for 律旋 (rissen): a seven-tone scale in gagaku, similar to the Dorian mode in the West