Definition
In the Aeronautical Information Manual glossary, 'Special' is a prefix or modifier indicating that a procedure, clearance, airspace, or service differs from the standard or default version, typically because conditions, equipment, or authorizations are not the norm. It signals that specific rules, limitations, or requirements apply rather than the general ones.
Plain English
It means 'not the usual version.' When you see 'Special' attached to an aviation term, it tells you the rules or conditions are different from the standard case and you need to look at what makes this version different.
Context Anchor
Seen in terms such as special VFR, special use airspace, special procedures, and special authorizations.
Derivation
From Latin 'specialis,' meaning 'individual' or 'particular,' from 'species' (a kind or type). In aviation usage it keeps that original sense: a particular case set apart from the general rule.
Why Pilots Care
Determines whether extra approvals, restrictions, or coordination are required before a flight can proceed.
Intuition Check
Special does not mean better, optional, or informal here. It means a particular case outside the normal category, usually with its own requirements.
Example Sentence 1
The controller asked whether the pilot wanted to request Special VFR before entering the Class D surface area in marginal weather.
Example Sentence 2
Special flight rules apply inside the Washington DC Special Flight Rules Area.