WordReference Random House Unabridged Dictionary of American English © 2026
cross′ ra′tio, [Geom.]
  1. Mathematicsa ratio relating four points in the real or complex plane. Also called anharmonic ratio. 
  • 1880–85
cross′-ra′ti•o′, adj. 

'cross ratio' also found in these entries (note: many are not synonyms or translations):
anharmonic ratio - harmonic conjugates

Forum discussions with the word(s) "cross ratio" in the title:


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