Pal·me (päl?m?), Olof 1927-1986. Swedish politician. As prime minister (1969-1976 and 1982-1986), he opposed the nuclear arms race. Palme was assassinated in 1986.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.