All 5 Uses

positive
in
The Choice, by Nicholas Sparks
(Auto-generated)

I think he's old man Cason's, but I'm not positive about that.†
p. 56.5 *

positive = certain
Her only saving grace—the only positive thing to come out of the whole experience—was that she'd apologized in his office.†
p. 65.5 *

positive = good
And I'll say yes when I'm positive he wants to marry me.†
p. 280.9
How much more positive can you get?†
p. 280.9
Truth be told, he wasn't even positive it was the same bird.†
p. 306.9

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.