What is the meaning of Ni-?

un-; de- (used to negate)

alternative form of ming-

Subject prefix for verbs; indicates that the subject is first person singular: I.

look at

I (used for conjugating verbs to the subjective or nominative case of the personal pronoun)

pronominal prefix for

partitive prefix

used to form the days of the week

uninterrupted, intensely

very, a lot

Used as an intensifier, especially in verbs

A prefix denoting the first person

new-, newly

I, first-person singular subject marker.

you, you all; second-person plural subject concord.

you, you all; second-person plural object concord.

second-person plural clitic, you all

second-person singular possessive pronoun, your

second-person singular possessive prefix, your

alternative form of na- (our (inclusive)) when preceded by a root-initial i

Allomorph of n- (third-person prefix) used for stems that begin with a consonant.

With following vowel lengthened if in an unreduced open syllable.

your, you

Prefix prepended to pronouns to denote a negative meaning, synonymous with ne- (no, not).

Prefix prepended to copula verb biti in present tense to denote a negative meaning, synonymous with ne- (not).

I, 1st person singular subject concord

verb-initial form of -ni- (me, 1st person singular object concord)

Nasal mutation of di-.

you, you all; second-person plural subject concord.

you, you all; second-person plural object concord.

you, you all; second-person plural subject concord.

you, you all; second-person plural object concord.

Source: wiktionary.org