IPA: //ˈsɜːrkjʊleɪtɪv//
KK: /ˈsɜrkjʊˌleɪtɪv/
Relating to or promoting the movement or flow of something, often used in the context of fluids or information.
The circulative system in the body helps transport blood and nutrients to various organs.
Circulative is formed from "circulare" (meaning to move in a circle) and the suffix "-ive" (meaning having the nature of). The word describes something that has the nature of moving in a circle or being circular in action.
Think of something that moves 'in a circle' ('circulare') — that's why circulative refers to actions that are circular in nature.