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.

from a distance

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

positive active verbal first-person singular concord

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

marks the first-person singular subject on a verb

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

stative/active verb forming

adjective forming

un-, not

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

Indefinite suffix, used with inalienable nouns, prepositions and non-stative verbs when no person prefix is added.

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-

Rōmaji transcription of

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.

added to adjective or noun to create a verb, along with the suffixes -ari or -iri.

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