IPA: /ˌkɔːrɪˈleɪʃənl/
KK: /kɔːrɪˈleɪʃənl/
Relating to a relationship or connection between two or more things, often used in statistics to describe how one thing may change in relation to another.
The researchers found a correlational link between exercise and improved mental health.
Correlational → It is formed from "cor-" (meaning together) and "relatio" (from Latin, meaning relationship) and the suffix "-al" (meaning pertaining to). The word "correlational" refers to something that pertains to or describes a relationship between two or more things.
Think of things that are 'together' ('cor-') in a 'relationship' ('relatio') — that's what correlational means.