noun A position in the hierarchy of the armed forces. (an army officer of fairly high rank) A single line of soldiers or police officers drawn up abreast. (they were drawn up outside their barracks in long ranks) The people belonging to or constituting a group or class. (the ranks of the unemployed) The value or the order of the largest nonzero determinant of a given matrix. (The rigidity of a matrix is the number of entries in a matrix which need to be changed in order to bring the rank of the matrix down to a certain value.)
verb Give (someone or something) a rank or place within a grading system. (she is ranked number four in the world) Arrange in a rank or ranks.
adjective (of vegetation) growing too thickly and coarsely. (clumps of rank grass) (especially of air or water) having a foul or offensive smell. (breathing rank air) (especially of something bad or deficient) complete and utter (used for emphasis) (rank stupidity)