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English definition of “instant”

instant

noun [C usually sing]  /ˈɪn·stənt/ us  
a very short moment of time, or a particular point in time: At that instant, someone knocked on the door. Call me the instant you get home (= as soon as you get to your home).

instant

adjective [not gradable]  /ˈɪn·stənt/ us  
happening immediately: I took an instant liking to him. An instant food or drink is one, usually in dried or powdered form, that can be prepared easily and quickly, esp. by adding hot water: instant coffee
(Definition of instant from the Cambridge Academic Content Dictionary © Cambridge University Press)
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