公こう比ひこうひMeanings1nouncommon ratio; geometric ratiomathematicsMathematical term for the constant ratio between consecutive terms in a geometric progression.等とう比ひ数すう列れつの公こう比ひを求もとめなさい。Find the common ratio of the geometric sequence.この数すう列れつの公こう比ひは2です。The common ratio of this sequence is 2.