確

cryptid (animal whose existence is unsubstantiated, e.g. the yeti)

confirmation of consent; confirming someone's wishes

apprehension (of a crime suspect); capture; detainment; arrest

Physics

probability amplitude (quantum mechanics)

Computing

connectivity test; connection check

system by which hitting a certain jackpot increases the probability of hitting the next jackpot (on prepaid card pachinko machines)

Grammar

fixed condition; preexisting condition

Rare term; Computing

dialogue establishment indication outstanding

Rare term; Computing

dialogue establishment request outstanding

'ku' adjective (archaic)

certain; sure; definite