Final answer:
A non-key attribute is functionally dependent on another non-key attribute in a table when one attribute can be determined by the value of another attribute.
Step-by-step explanation:
In a table, when a non-key attribute is functionally dependent on another non-key attribute, it means that one attribute can be determined by the value of another attribute in the table.
For example, let's consider a table of students where the student's grade is functionally dependent on their age. If we know the age of a student, we can determine their grade. In this case, age is the determining attribute and grade is the determined attribute.
This type of relationship is known as functional dependency and is a key concept in database management.