Special
Part of speech: adjective
Definition: Distinguished by a unique or unusual quality. Of particular interest or value; certain; dear; beloved; favored. Retarded; mentally handicapped Constituting or relating to a species.
Part of speech: noun
Definition: A reduction in consumer cost (usually for a limited time) for items or services rendered Unusual or exceptional episode of a series A special constable A reduction in consumer cost (usually for a limited time) for items or services rendered.
Unique
Part of speech: adjective
Definition: Being the only one of its kind; unequaled, unparalleled or unmatched.Of a feature, such that only one holder has it.(disputed) Of a rare quality.(disputed) Unusual.