(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

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

the twenty-four divisions of the solar year / the twenty-four terms used to denote the changing of the seasons