determinant

noun
UK /dɪˈtɜːmɪnənt/
US /dɪˈtɜːrmɪnənt/

A determinant is something that decides or controls what happens.

Hard work was the main determinant of her success.


OTHER MEANINGS

2. In math, a number calculated from a square matrix that helps solve equations.

The determinant of the matrix was zero, so it had no inverse.

3. A gene or substance that controls a trait or outcome in biology.

Researchers identified a genetic determinant of the disease.

4. A word that limits or specifies a noun, such as 'the' or 'this'.

In grammar, 'the' is a common determinant.