Definitions

1. verb

to make or put into three parts or groups; to divide into three parts or groups

“The student had to tertiate the essay into introduction, body, and conclusion.”

2. verb

to divide into three parts or groups, especially for voting or decision-making

“The committee decided to tertiate the proposals into three categories: finance, human resources, and operations.”

3. noun

a division or group of three

“The tertiate of the jury voted in favor of the defendant.”