Source : Webster's Revised Unabridged Dictionary (1913)

Imperialist \Im*pe"ri*al*ist\, n. [Cf. F. imp['e]rialiste.]
   One who serves an emperor; one who favors imperialism.

Source : WordNet®

imperialist
     adj : of or relating to imperialism; "imperialistic wars" [syn: {imperialistic}]

imperialist
     n : a believer in imperialism