IPA: /ˌsɛmioʊˈfɪʃəl/
KK: /sɛmiˈɔfɪʃəl/
Having a degree of official status or recognition, but not fully official.
The semiofficial report provided insights into the government's plans.
Semiofficial → It is formed from "semi-" (meaning half or partially) and "official" (from Latin "officialis", meaning pertaining to an office or authority). The word "semiofficial" refers to something that is partially official or has some degree of authority but is not fully recognized as official.
Think of 'semi-' meaning partially, and 'official' relating to authority — so semiofficial describes something that has partial authority.