n.
Function: noun
Date: 1650
1 : one that is intermediate
2 : MEDIATOR , GO-BETWEEN
3 a : a chemical compound synthesized from simpler compounds and usually intended to be used in later syntheses of more complex products b : a usually short-lived chemical species formed in a reaction as an intermediate step between the starting material and the final product
4 : an automobile larger than a compact but smaller than a full-sized automobile