NOUN (1)

1. an epidemic that is geographically widespread; occurring throughout a region or even throughout the world;


ADJECTIVE (2)

1. epidemic over a wide geographical area;
- Example: "a pandemic outbreak of malaria"

2. existing everywhere;
- Example: "pandemic fear of nuclear war"

The Collaborative International Dictionary of English v.0.48:

Pandemic \Pan*dem"ic\, a. [L. pandemus, Gr. ?, ?; pa^s, pa^n,
   all + ? the people: cf. F. pand['e]mique.]
   Affecting a whole people or a number of countries; everywhere
   epidemic. -- n. A pandemic disease. --Harvey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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