What is the meaning of A-?

Used to form taxonomic names indicating a lack of some feature that might be expected

Forming verbs with the sense away, up, on, out.

Forming verbs with the sense of intensified action.

In, on, at; used to show a state, condition, or manner. Also passing into sense 2.

In, into. Also passing into sense 5.

In the direction of, or toward.

At such a time.

In the act or process of. Used in some dialects before a present participle.

Alternative form of y- In dialect, it is sometimes conflated with sense 5 of the previous definition, and is used as a general indicator of a participle.

Used to form the past participle of a verb.

Forming words with the sense of wholly, or utterly out.

Not, without, opposite of.

Towards; Used to indicate direction, reduction to, increase to, change into, or motion.

Away from.

Of, from.

Alternative form of -a (empty syllable added to songs, poetry, verse and other speech)

Used as a prefix to verbs in the sense of remaining in the same condition. Actively doing something.

prefix attached to words relating to the mouth, such as the names of languages

Used to show a state, condition, or manner.

Attaches to verbs, sometimes adding a sense of "toward".

adjectival prefix to words denoting height, length, or depth

my

irrealis prefix

Used to form a few adverbs signifying a location or motion from or to above.

they; class 6 subject concord.

of; class 6 possessive concord.

Class 6 relative concord.

indicating the first or best in something

a-

Short for atom-.

a-

from, away, off, out

indicating movement towards something

indicating a change of state

intensifying prefix

alternative form of es-

him

it

active verb forming

adjective forming

un-, not

forming words with the sense from, away, out, off, e.g. animan

they; class 6 subject concord.

they; class 6 subject concord.

of; class 6 possessive concord.

Class 6 relative concord.

he, she, it; class 1 subject concord, used in the subjunctive and potential mood.

they; class 6 subject concord.

of; class 6 possessive concord.

used to form adjectives indicating a quality

the masculine form of nouns.

the masculine form of adjectives.

he, she; class 1 subject concord

allomorph of öt- (detransitivizing prefix)

allomorph of ö- (second-person prefix) used for stems that begin with a consonant and have a first vowel a or e

With following vowel lengthened if in an unreduced open syllable.

a- (not, without)

used to make verbs from adjectives and nouns

a-, un- (not)

A- (atomic, nuclear)

a-: not, without, opposite of

without, -less

a-, non-, un-

A prefix forming words, especially verbs, that denote entering a state, making progress toward a goal, or the like.

a-, non-, -less

added to adjective X, forms verbs meaning to make/turn X

added to noun X, forms verbs meaning to cause or make X or to cause something to have X

a- (not; without)

a- (not, without, opposite of)

a- (not, without, opposite of)

a- (not, without, opposite of)

Alternative form of ath- used before t

ad-

a-

Alternative form of ab-

Alternative form of ad-

Not, not having, without, opposite of.

someone's, people's

compare Italian a-

forming words with the sense of negation, a-

added to adjective X, forms verbs meaning to make/turn X

added to noun X, forms verbs meaning to cause or make X or to cause something to have X

a- (not; without)

ad- (toward, to, tendency)

on

off

to

away from

against, opposite

one

ah

towards

away from

Prefix prepended to words to denote a negation, deprivation or absence of a property denoted by base word.

forms words, especially verbs, that denote entering a state, making progress toward a goal, or the like

a-, non-, -less

she, he; 3rd person singular (m class(I)) subject concord

Contraction of a- + -a- (3rd person singular (m class(I)) gnomic).

at (indicating time)

forms contemplative aspect forms for verbs in the object or directional trigger

affirmative prefix, emphasises prefixed word

they; class 6 subject concord.

of; class 6 possessive concord.

Class 6 relative concord.

not

he, she, it; class 1 subject concord, used in the subjunctive and potential mood.

they; class 6 subject concord.

of; class 6 possessive concord.

Used to form relative clauses.

Class 6 relative concord.

not

Alternative form of ma- (hortative)

Source: wiktionary.org