Definitions

1. adjective

relating to, consisting of, or characterized by three parts or components

“The trilateral agreement between the countries aimed to reduce trade barriers.”

2. noun

a three-sided polygon or an association of three nations or countries

“The trilateral summit brought together leaders from three major world powers.”

3. noun

a triangular or three-sided shape

“The trilateral figure was used in the mathematical model to predict population growth.”