On: Oregon Just Voted to Legalize Duplexes on Almost E...

[icebraining]

I think a semi-detached is a duplex, but the latter term is more broad, covering also two-story apartment buildings and such: https://en.wikipedia.org/wiki/Duplex_(building)

[vidarh → icebraining]

'Semi-detached' can be used about the end unit of a long chain of terraced houses, so while a semi-detached can be part of a duplex, it might also not be.