resembling or having a likeness to something
"The quasi-official committee met in the boardroom to discuss potential policy changes."
In plain English: Quasi means something that looks, acts, or feels very much like another thing but isn't exactly it.
"The quasi-official meeting was held in a private dining room rather than at City Hall."
Usage: Use quasi- before an adjective, noun, or participle to indicate that someone or something resembles the quality of another without fully being it. Avoid using this prefix with verbs directly; instead, attach it to the verb's past participle form (e.g., use "quasi-retired" rather than "quasi-retiring").
The word quasi entered English as a learned borrowing directly from Latin, where it originally meant "as if." It has retained this sense of being something that resembles or appears to be another thing without actually being it.