A term originally referring to a genre of dance music from Detroit. It has since become extremely overused. Pretty much any music with synthesizers is labeled as "techno" now. It is often incorrectly used to refer to edm, and its subgenres.
When I heard a friend say: "You know, technically Owl City is techno", I realized that the term "techno" had lost all meaning
Friend: "What you you listening to?"
Me: "Drum and bass. Here, listen"
Friend: "This is techno. It was made with a computer"