Definition of duplexes:
(adj) :
Double; made up of two parts.
(adj) :
(architecture) Having two units, divisions, suites, or apartments.
(n) :
(US, Canada, Australia) A house made up of two dwelling units.
(adj) :
(architecture) Having two floors.
(n) :
(US) A dwelling unit with two floors.
(adj) :
(telecommunications) Bidirectional (in two directions).