equidifferent

[Pref. equi-, and Eng. dif. ferent (q. v.).] *1. Ord. Lang.: Having equal differences; arithmetically proportional. †2. Crystal log.: Having a different number of faces presented by the prism and by each summit, the numbers forming an arithmetical progre ion, 6, 4, 2. equidifferent series, s. Arith.: The same as arithmetical progre ion; an arithmetical series having the difference between the first and second, the second and the third, the third and the fourth, and so on, equal. Thus, 4, 8, 12, 16, and 21, 18, 15, 12 are equidifferent series.