Meanings

a samurai never goes back on his word

titanium dioxide

motorcycle license

duality

double-slit experiment

Second Section of the Tokyo Stock Exchange

double-booking

(having) two choices

second-grade tea (second picking)

double disaster

second slash

secondary delusion

dropping two unpromoted pawns on the same file (illegal move)

two nights

game of shogi in which the stronger player plays without a rook and a bishop

biaxial

double factorial

Shuni-e (ceremony held at some temples in February)

digon

dodecagon