Forex glossary - K
Knock-in Option (see also Knock-Out Option; Trigger Price) - An option the existence of which is conditional upon a pre-set trigger price trading before the option's designated maturity. If the trigger is not touched before maturity, then the option is deemed not to exist.
Knock-out Option - An option the existence of which is conditional upon a pre-set trigger price trading before the option's designated maturity. The option is deemed to exist unless the trigger price is touched before maturity.