Definition of "diametrical" [diametrical]

• Of, relating to, or along a diameter. (adjective)
• Exactly opposite; contrary. (adjective)

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.

• "These ideologically diametrical right and left poles of Pakistani politics are held together only one common trait: their common elitist nihilism."
• "Syria is almost the diametrical opposite of all that."
• "The Sextons dub this syndrome "conspicuous conservation," which is directly diametrical to "conspicuous consumption" -- our current materialistic cultural orientation that contributes mightily to the unsustainable exploitation of the earth's natural resources."