Definitions for officialeseəˌfɪʃ əˈliz, -ˈlis
Random House Webster's College Dictionary
of•fi•cial•eseəˌfɪʃ əˈliz, -ˈlis(n.)
a style of language typically used in official statements, characterized by polysyllabic jargon and pretentiously wordy phrasing.
Origin of officialese:
the style of writing characteristic of some government officials: formal and obscure
The typical language of official documents, legalistic and pompous.