secret; confidential

storehouse, warehouse, cellar, magazine, granary, etc. (a building or interior space whose primary function is storage) / stock, supply, reserve, store (the amount of something so stored)

auditory phonetics

(linear algebra) upper triangular matrix

(operations, mathematics) linear programming

mixed martial arts

a combat sport match where opponents compete against each other using different styles of martial arts

Allen key; hex head wrench

comparative linguistics

異種格闘技戦: a combat sport match where opponents compete against each other using different styles of martial arts