The Collaborative International Dictionary of English v.0.48:

Governmental \Gov"ern*men"tal\, a. [Cf. F. gouvernemental.]
   Pertaining to government; made by government; as,
   governmental duties.
   [1913 Webster]

WordNet (r) 3.0 (2006):

governmental
    adj 1: relating to or dealing with the affairs or structure of
           government or politics or the state; "governmental
           policy"; "public confidence and governmental morale"

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "governmental":
   absolute, aristocratic, authoritarian, autocratic, autonomous,
   bureaucratic, civic, civil, constitutional, democratic, despotic,
   dictatorial, diplomatic, fascist, federal, federalist,
   federalistic, geopolitical, gubernatorial, heteronomous,
   matriarchal, matriarchic, monarchal, monarchial, monarchic,
   monocratic, official, oligarchal, oligarchic, parliamentarian,
   parliamentary, patriarchal, patriarchic, pluralistic, politic,
   political, politico-commercial, politico-diplomatic,
   politico-economic, politico-geographical, politico-judicial,
   politico-military, politico-moral, politico-religious,
   politico-scientific, politico-social, politico-theological,
   republican, self-governing, statesmanlike, suffragist, theocratic,
   totalitarian