The Collaborative International Dictionary of English v.0.48:
Protectionism \Pro*tec"tion*ism\, n. (Polit. Econ.) The doctrine or policy of protectionists. See Protection, 4. [1913 Webster]WordNet (r) 3.0 (2006):
protectionism n 1: the policy of imposing duties or quotas on imports in order to protect home industries from overseas competition