a. Math. [CONTRA- 2.] Opposed or opposite to harmonical.
When three numbers are in harmonical progression, then a : c :: a–b : b–c. The reverse of this, viz. a : c :: b–c : a–b is termed contra-harmonical proportion.
1727–51. in Chambers, Cycl.
Hence Contraharmonically adv.
1727–51. Chambers, Cycl., s.v., Thus, e.gr., 3, 5, and 6, are numbers contra-harmonically proportional.
