(linear algebra) upper triangular matrix

secret

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)

mixed martial arts

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

broaden / extend / expand / enlarge

(archaic) basin, tub / body of a traditional Japanese stringed instrument (such as biwa or kugo)

auditory phonetics

(operations, mathematics) linear programming