(grammar) The Classical Japanese bigrade verb conjugation class, consisting of the two subclasses of 上(かみ)二(に)段(だん)活(かつ)用(よう) (kami nidan katsuyō, “upper-bigrade conjugation”) and 下(しも)二(に)段(だん)活(かつ)用(よう) (shimo nidan katsuyō, “lower-bigrade conjugation”)

dodecahedron

double-pane window, found especially in Hokkaido and Tōhoku as cold-proofing

a Classical Japanese adjective with シク活用 (shiku-katsuyō, “shiku-inflection”)

double dipping

(video games) new game plus

(Internet) redistribution

great icosihemidodecahedron

kill two birds with one stone, do one task and finish two or more goals (literally, “one stone, two birds”)

(obsolete) round the clock / (obsolete) all the time