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1.
Pronounced "1-via". Onevia is a portmanteau combining the words 180sx and Silvia. The car is creating by adding a 180sx front end (pop-up headlights) onto an S13 Silvia.
A 240sx coupe looks like a Onevia. A Onevia is also the opposite of the Sileighty.
by kdigital February 27, 2009
 
2.
180sx front silvia rear. Also known as 240sx in Canada and US.

It has been said that the Onevia was produced factory by Nissan but it wasn't. The sil80 was, but only a few.
Wack us a Onevia, they looks mahd!
by Mr.Universe November 27, 2005