Belief in or support of the tenets of the political left.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "leftism" in a sentence
"About the only thing that excommunicates him from leftism is raging homophobia."
"Obviously it has to do with conservative contempt for what they perceive as refined culture, and the arts (artists being after all mostly “radicals” and “revolutionaries” as the old stereotype goes), the boogeyman of the French Revolution and revolutionary leftism is in there somewhere, the conservative sense of the French as ‘effeminate’, & too latin, is also in there."
"I think that an MRV perspective on academic leftism is to say that notwithstanding the mission of academicians to seek truth, politically they have no more motivation to be rational than anyone else."