1. a person or thing that determines or decides something
Usage: informal; not widely used in standard dictionaries; more common in technical or specialized contexts

Examples

• The final determinator of the project's success was the team's ability to meet the deadline.
• In mathematics, the determinator of a matrix is a key value in linear algebra.
• Customer feedback became the primary determinator of product design changes.
• The weather was the determinator of whether the outdoor event would proceed.