Source : Webster's Revised Unabridged Dictionary (1913)

Pandemic \Pan*dem"ic\, a. [L. pandemus, Gr. ?, ?; ?, ?, all + ?
   the people: cf. F. pand['e]mique.]
   Affecting a whole people or a number of countries; everywhere
   epidemic. -- n. A pandemic disease. --Harvey.

Source : WordNet®

pandemic
     adj 1: epidemic over a wide geographical area; "a pandemic outbreak
            of malaria"
     2: existing everywhere; "pandemic fear of nuclear war"
     n : an epidemic that is geographically widespread; occurring
         throughout a region or even throughout the world