semi

noun

1. (Australia, Canada, Ireland, UK, informal)A semi-detached house.

   “2008, Elliott Placks, quoted in Helen Isbister, Morris Bryant, Property, Career FAQs, Australia, page 40, I′m selling two side-by-side semis that are currently under construction, a waterfront apartment and a house in Rose Bay.”

   “The smaller semis of the 1920s and 1930s were closely related to the three bedroom pre-1919 narrow fronted terraces, at least to the larger pre-1919 terraces.”

   “The roads were lined with cramped little semis and 1960s bungalows: Britain's cheapest houses, in their flimsy, pebble-dashed glory.”

2. (Australia, Canada, New-Zealand, US)A semi-trailer; a tractor-trailer; an eighteen-wheeler; an artic.

   “I was hungry an' freezin' an' done caught a chill / When the lights of a big semi topped the hill”

   “All night we couldn′t hear each other speak because of the sound of semis changing gear to get over the hill.”

3. (informal)A semifinal.
4. (slang)A partial erection of the penis.

   “The twink got a semi just from that look.”

5. (slang)A semiautomatic firearm.

   “See these niggas through the reticle sight up on my semi […] For niggas plottin', I might blow it at your fitted Get your bitch-ass slimed out, it ain't no kiddin' Ain't no kiddin', got that semi”

6. (slang)Semiconductor companies or positions in the stock market.
7. (colloquial)An intermediate in the production of end-use goods.

adv

1. (informal, not-comparable)Somewhat; to some extent.

   “'Is that a serious question?' he asked. Ralph shrugged with his face, jutting out his bottom lip. 'Well ... semi,' he said.”