Here I found this:
Definition: A determinant in a database table is any attribute that you can use to determine the values assigned to o
From my understanding, a determinant may not be a candidate key if the table is not fully normalized. In fact, the word determinant is used when describing the process of taking non-normal data to a more useful, normalized form.
Consider this (obviously non-normal) table:
CREATE TABLE US_Address (
AddressID int,
Streetline varchar(80),
City varchar(80),
State char(2),
ZIP char(5),
StateName varchar(80),
StateTax DECIMAL(5,2)
)
State is a determinant for StateName and StateTax, but it is not a candidate key for the row. Proper normalization, would therefore move StateName and StateTax out of the US_Address table and into a States table.
See here for more information.