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Definition of Aftertouch
1. Noun. (music uncountable) Pressure sensitivity on an electronic synthesizer, allowing the musician to change the tone or sound of a note after it is struck. ¹
2. Noun. (rare) A touch (feature or characteristic) added finally or as an afterthought. ¹
¹ Source: wiktionary.com
Medical Definition of Aftertouch
1. Persistence of tactile sensation after cessation of the stimulus. (05 Mar 2000)