Definition: (1) Noun: signals or recording resulting from radiation or other stimulation falling onto a light-sensitive or sensitised system. * May be characterised as e.g. linear i.e. response is proportional to strength of radiation or non-linear. (2) Adjective: ~ time: the length of delay between a stimulation or signal and the reaction e.g. how long it takes for a sensor to register a change in environment, how quickly a camera takes a picture when commanded to, by pressing the shutter button.

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