definitive >> /dəˈfɪnədɪv/
Definition: [noun] A definitive postage stamp.
Example: low-value British definitives simply have a portrait of the reigning monarch
Definition: [adjective] (of a conclusion or agreement) done or reached decisively and with authority.
Example: a definitive diagnosis
Definition: [adjective] (of a postage stamp) for general use and typically of standard design, not special or commemorative.
Example: This review includes definitive and commemorative stamp types with some exceptions.