definitive

US /dɪˈfɪn.ə.t̬ɪv/
UK /dɪˈfɪn.ə.t̬ɪv/
1.

xác định

a definitive postage stamp.

:
low-value British definitives simply have a portrait of the reigning monarch
1.

xác định

(of a conclusion or agreement) done or reached decisively and with authority.

:
a definitive diagnosis
2.

xác định

(of a postage stamp) for general use and typically of standard design, not special or commemorative.