plural of coal rank

(geology) The measure or degree of the progressive coalification (organic metamorphism) of a coal, often expressed in terms of vitrinite reflectance.

plural of cab rank

Synonym of taxi rank / (military) A group of aircraft that remain airborne in order to attack targets quickly when requested.

plural of rank outsider

(politics, often attributively) Any voting system in which voters rank their candidates (or options) in order of preference on their ballots.

(number theory) Given a positive integer m and a divisibility sequence Sₖ, the smallest index k such that Sₖ is divisible by m;

plural of rank of apparition

(mathematics, linear algebra, of a matrix) Not having full rank; having a rank (dimension) less than the number of columns and the number of rows.

(mathematics, linear algebra, of a matrix) Having the highest possible rank for its size; having a rank (dimension) equal to the the number of columns or the number of rows.