All 4 Uses

positive
in
The History of Love
(Auto-generated)

I saw this as a positive thing, but when Henry Lavender called that afternoon my mother was at the supermarket and didn't call him back.†
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positive = good
After two hours, the woman said she was absolutely one-hundred-percent positive there was no Alma Mereminski who died in New York City after 1948.†
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positive = certain
When I was almost 100 percent positive that I was a lamed vovnik I used to think G-d could hear me.†
I was almost 100 percent positive she was going to say no. But instead a funny look came over her face and she said I suppose so, yes!†

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.