All 9 Uses of

positive

in

Ulysses by James Joyce

I am positive when I say that if need were I could produce a cloud of witnesses to the excellence of her noble exercitations which, so far from being a byword, should be a glorious incentive in the human breast.
Chpt 14 (definition 1) *

positive = certain

Also, without being actually positive, it struck him a great field was to be opened up in the line of opening up new routes to keep pace with the times apropos of the Fishguard-Rosslare route which, it was mooted, was once more on the tapis in the circumlocution departments with the usual quantity of red tape and dillydallying of effete fogeydom and dunderheads generally.†
Chpt 16 (definition 1)

Like actresses, always farewell positively last performance then come up smiling again.†
Chpt 16 (definition 1)

Reduce Bloom by cross multiplication of reverses of fortune, from which these supports protected him, and by elimination of all positive values to a negligible negative irrational unreal quantity.†
Chpt 17 (definition 1)

If any, positively, connivance, introduction of emulation (material, a prosperous rival agency of publicity: moral, a successful rival agent of intimacy), depreciation, alienation, humiliation, separation protecting the one separated from the other, protecting the separator from both.†
Chpt 17 (definition 1)

Positive: he included mention of a performance by Mrs Bandmann Palmer of LEAH at the Gaiety Theatre, 46, 47, 48, 49 South King street, an invitation to supper at Wynn's (Murphy's) Hotel, 35, 36 and 37 Lower Abbey street, a volume of peccaminous pornographical tendency entituled SWEETS OF SIN, anonymous author a gentleman of fashion, a temporary concussion caused by a falsely calculated movement in the course of a postcenal gymnastic display, the victim (since completely recovered)…
Chpt 17 (definition 1)

positive = certain

Uses with a very rare meaning:

Definitions:

(1) (positive as in: I'm absolutely positive!)
certain (having no doubt; or used for emphasis)

(2) (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.