Midi/ˈmɪdi/ Definition 1 of 4Pro Tip 1/3Technical Use Used specifically in music tech; unfamiliar outside that context. The keyboard's midi capability made recording easier. Pro Tip 2/3Electronic Devices Refers to the connection between modern musical equipment. He connected the synth to the sequencer using midi. Pro Tip 3/3Music Production Midi is essential for producers and composers in digital music. With midi, you can control virtual instruments on your software.