All 4 Uses of

positive
in
Nineteen Minutes

In the reflection of the mirror, she watched the girl who looked just like her take a tube of lipstick-'Positively Hot!' the label read-and apply it.
Chpt 1 *

positively = absolutely (used for emphasis)

And then, slowly, she watched the second, perpendicular line appear: a plus sign, a positive, a cross to bear.
Chpt 1 *

positive = greater than zero

I took a pregnancy test today. It was positive.
Chpt 1 *

positive = indicating that a condition was found

After three positive pregnancy tests, after her period was three weeks late-she was miscarrying.
Chpt 1

Definitions:

(1) (positive as in: I'm absolutely positive!)
certain (having no doubt; or used for emphasis)
(2) (positive as in: had a positive effect)
good or beneficial
(3) (positive as in: positive feedback from my boss)
approval or agreement
(4) (positive as in: a positive attitude)
optimistic (expecting or focusing on good things); or agreeable
(5) (positive as in: The test came back positive.)
found a condition or substance to be present
indicating the presence of something being tested for -- especially a disease, condition, or substance
(6) (positive as in: a positive number)
greater than zero (of a number)
(7) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

See a comprehensive dictionary for less common meanings of positive including some in the fields of electricity, physics, chemistry, medicine, philosophy, and grammar. Note that most all senses of positive indicate that something is good or present.