cluster variable

noun2

1. •
   A variable whose values are used to classify data points into clusters; a variable that identifies one of the defining properties of clusters.

   • The first model includes the potential cluster variable conditioned on clustering variables already selected, while in the second model the variable is not included. — 2011
2. •
   an RR Lyrae variable; a type of variable star commonly (but not exclusively) found in globular clusters

   • This period, which is exceptionally long for a cluster variable, satisfies the observations fairly well except in a few cases. — 1902