Longman Dictionary of Contemporary English
quasi-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ a quasi-scientific theory
▪ the chairman's quasi-judicial role
Douglas Harper's Etymology Dictionary
quasi-
word-forming element used since 18c. (but most productively in 20c.) and typically meaning "kind of, resembling, like but not really, as if;" from Latin quasi "as if, as it were" (see quasi).
Wiktionary
quasi-
pre. similar to, but not exactly the same as; virtual(ly). (from 17th c.)