Semi vs. Quasi — What's the Difference?

A semitrailer.

Quasi (phonetics 'kwa - zee') is an American indie rock band formed in Portland, Oregon in 1993 by former spouses Sam Coomes (vocals, guitar, rocksichord, various keyboards, bass) and Janet Weiss (vocals and drums). Joanna Bolme performed and recorded with the group as a bassist from 2007 to 2011.

A tractor-trailer.

Having a likeness to something; resembling

A semifinal.

Resembling or having a likeness to something.

A semiformal dance.

As if; as though; as it were; in a manner sense or degree; having some resemblance to; qualified; - used as an adjective, or a prefix with a noun or an adjective; as, a quasi contract, an implied contract, an obligation which has arisen from some act, as if from a contract; a quasi corporation, a body that has some, but not all, of the peculiar attributes of a corporation; a quasi argument, that which resembles, or is used as, an argument; quasi historical, apparently historical, seeming to be historical.

A semi-detached house.

Having some resemblance;

A semi-trailer; a tractor-trailer; an eighteen-wheeler; an artic.

(informal) A semifinal.

(slang) A partial erection of the penis.

One of the two competitions in the next to the last round of an elimination tournament

A truck consisting of a tractor and trailer together

A trailer having wheels only in the rear; the front is supported by the towing vehicle