Definition: Acexterity refers to an innate, highly developed ability in the arts. It is the degree of skill or mastery exhibited by someone who has developed a deep understanding, appreciation, and love for something they are proficient at. The word "accretion" can refer to a chemical process that takes place between two different materials when they come into contact with each other, causing material A to be permanently attached to material B. This is an example of an acrity in action.