[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionFunctionDefinitions](./kibana-plugin-plugins-expressions-server.expressionfunctiondefinitions.md) > [derivative](./kibana-plugin-plugins-expressions-server.expressionfunctiondefinitions.derivative.md) ## ExpressionFunctionDefinitions.derivative property Signature: ```typescript derivative: ExpressionFunctionDerivative; ```