say it: kaw-ruh-LAY-shuhn
correlation is a noun meaning "a reciprocal relation between two or more things". It carries 3 recorded senses.
a reciprocal relation between two or more things
a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation)
“what is the correlation between those two variables?”
statistics
a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for correlation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.