The phrase "to define the term" means to provide a clear and specific explanation or description of what a particular word or concept means. Full definition
Parties have the power, within limits, of defining the terms of an election, and it therefore matters what kind of election Labour intends to win. (blog.politics.ox.ac.uk)
The term «basic estate plan» is not a clearly defined term in the legal industry. (wa-wills.com)
However, the agreement doesn't define terms such as parking tickets and tuition. (speakingofcredit.com)