久

spotbelly greenling (Hexagrammos agrammus)

Medicine

persistent disease

Yakushima macaque (Macaca fuscata yakui)

Company name

Junkudo (Japanese bookstore chain)

semipermanent

Physics

perpetual motion machine; perpetual motion engine; perpetuum mobile

permafrost

permanent preservation; permanent repository; keeping something permanently; preservation in perpetuity

Usu. adverbially as 幾久しく

everlasting; eternal; continued; unchanging

Idiomatic expression; Colloquial

marrying to become a housewife; permanent employment (once one becomes a housewife)

permanence; forever unchanging

continued luck in the fortunes of war

retired (uniform) number

endurance race (motorsport)

for many years; anciently

Suru verb - special class

to apologize for a long neglect of friends (apologise)

version for permanent preservation; version worth preserving forever; (must-have) collector's edition

Physics

perpetual motion

removing hair permanently

Organization name

Kurihama Reform School

permanent revolution

durable (consumer) goods

In formal correspondence or greetings

forever; eternally

permanent magnet