of ‧ fi ‧ cial ‧ ese /əˌfɪʃ ə lˈiːz/ BrE AmE noun [uncountable] informal
[ Word Family: noun : ↑ office , ↑ officer , ↑ official , ↑ officialdom , ↑ officialese , ↑ officiousness ; adverb : ↑ officially ≠ ↑ unofficially , ↑ officiously ; adjective : ↑ official ≠ ↑ unofficial , ↑ officious ; verb : ↑ officiate ]
a way of talking or writing used by government officials, that is unnecessarily difficult to understand