NOUN (1)

1. a Jewish supporter of Zionism;


ADJECTIVE (2)

1. relating to or characteristic of Zionism;
- Example: "the Zionist movement"

2. relating to or characteristic of a supporter of Zionism;
- Example: "the Zionist leader Theodor Herzl"

The Collaborative International Dictionary of English v.0.48:

Zionism \Zi"on*ism\, n. [Zion + -ism.]
   Among the Jews, a theory, plan, or movement for colonizing
   their own race in Palestine, the land of Zion, or, if that is
   impracticable, elsewhere, either for religious or
   nationalizing purposes; -- called also Zion movement. --
   Zi"on*ist, n. -- Zi`on*is"tic, a.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Zionist
    adj 1: relating to or characteristic of Zionism; "the Zionist
           movement"
    2: relating to or characteristic of a supporter of Zionism; "the
       Zionist leader Theodor Herzl"
    n 1: a Jewish supporter of Zionism