The characteristic language, jargon, or style of speaking used by federal government officials and bureaucrats.
American English creation from federal plus -ese (a suffix meaning 'the language or style of'), similar to bureaucratese or officialese.
Federalese is that baffling language where a simple idea gets wrapped in so many clauses and acronyms that only government workers can understand it—it's basically how bureaucracies hide simplicity under complexity.
Complete word intelligence in one call. Free tier — 50 lookups/day.