positive

2. Certain or sure about something.

I am positive that I locked the door before we left.

3. Showing that something is present or true, as in a test result.

The doctor said the test was positive, so she needs some medicine.

4. A number greater than zero.

Five and ten are positive numbers, but minus three is not.

5. Good or helpful in effect.

Getting enough sleep has a positive effect on your mood.