Not official or not done as part of official duties; happening outside the scope of formal authority or position.
From Latin 'extra' (outside) + 'official' (from Old French 'oficial', relating to office or duty). The prefix 'extra-' has been productive in English since the 1600s for creating adjectives meaning 'beyond' or 'outside the normal scope.'
This word captures a uniquely modern phenomenon—the informal networks and backdoor dealings that actually run institutions. Think of a principal helping a student outside school hours, or a CEO making decisions at a golf course rather than in the boardroom; these extraofficial arrangements often matter more than official ones.
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