All 6 Uses

positive
in
Carrie, by Stephen King
(Auto-generated)

Like the Flatlands Society, the Rosicrucians, or the Corlies of Arizona, who are positive that the atomic bomb does not work, these unfortunates are flying in the face of logic with their heads in the sand-and beg your pardon for the mixed metaphor.†
*

positive = certain
Q. Are you positive?†
The car went into a screaming slide and she shrieked aloud, suddenly positive of her own death.†
You're positively GLOWING.†
If the TB test shows positive, a child can be treated or isolated.†
If the TK test shows positive, we have no treatment except a bullet in the head.†

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)
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.