Definition of semi-proof:
(n) :
(informal) A semifinal.
(n) :
(UK, Ireland, Australia, Canada, informal) A semi-detached house.
(n) :
(Australia, Canada, New Zealand, US) A semi-trailer; a tractor-trailer; an eighteen-wheeler; an artic.
(adv) :
(informal) Somewhat; to some extent.
(n) :
(slang) A partial erection of the penis.
(n) :
(slang) A semiautomatic firearm.