What is the meaning of Aa?

ISO 639-1 language code for Afar.

A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.

Initialism of acetic acid.

Initialism of acting age.

Initialism of alveolar-arterial.

Initialism of aminoacetone.

Initialism of amino acid.

Initialism of approximate absolute.

Initialism of arachidonic acid.

Initialism of armature accelerator.

Initialism of ascending aorta.

Initialism of atomic absorption.

Initialism of author's alteration.

Initialism of average audience.

Initialism of arctic-alpine.

Initialism of always afloat.

Abbreviation of adjectives.

Abbreviation of arteries.

Abbreviation of ana (“of each, equal parts”).

I.

also; too; as well; either; neither (in addition to whatever or whoever has previously been listed)

Used for emphasis.

1. To confirm a preceding statement: really, actually, indeed, in fact, exactly (always unstressed)

   To confirm a preceding statement: really, actually, indeed, in fact, exactly (always unstressed)

   To confirm a preceding statement by someone else: really, actually, indeed, in fact

   Emphasis on a preceding conjunction (often with no) (always stressed)

   Emphasis on a preceding negative statement: even (always stressed)

   Implies doubt in a yes-no question really (always unstressed)

   To imply that something is unreasonable; also used when expressing reproach, anger, astonishment, etc. (always unstressed)

   (implying an extreme example in the case mentioned, as compared to the implied reality): even (always stressed)

   as in whatever, whenever, however, etc. ever (always unstressed)

   to open

   to be open

   to open mouth

   a, an

   yes, I know

   I agree: expresses listener's agreement with storyteller or speaker

   expresses exasperation, criticism or dismay over what another person does or says, said in breathy voice

   expression of surprise or awe

   ah! (denoting amazement)

   act of going to the devil

   farmyard

   threshing floor

   no, not, without

   chicken

   here

   river, stream

   alternative form of a, third-person singular present indicative of mynet

   up, above

   obsolete spelling of å

   obsolete spelling of å

   obsolete spelling of og

   obsolete typography of å

   obsolete typography of å

   obsolete typography of å

   obsolete typography of å

   obsolete typography of å

   contraction of a + a (“to/at the”)

   wing

   there (far from the speaker)

   mould, mildew

   A letter of the Tlingit alphabet, written in the Latin script.

   yep, yeah

   aha, uh-huh

   chicken

   alternative spelling of a

   An interjection expressing recognition -

   An interjection expressing understanding -

   The name of the Latin-script letter A/a.

   The name of the Latin-script letter A/a, called a in English.

   oh, ah (expression of recognition, realization, understanding, etc.)

   the surface of an aa lava flow

   seine, net

   web

   older brother

   aa (type of lava flow)

   Rōmaji transcription of ああ

   romanization of ꦲꦲ

   yeah, uh-huh (expression of agreement, understanding)

   yeah, uh-huh (expression of agreement)

   comparative degree of aeg (“young, adolescent, immature”)

   no

   also, too

   to be sure, certainly, indeed

   to be sure!

   on (of a light)

   in session (of a school)

   burning (of a fire)

   on, starting

   Shetland form of a' (“all”)

   older brother

   Expresses agreement or affirmation; yeah, yes

   dirty things; filth (especially feces)

   an exclamation expressing warning

   name of the Baybayin letter ᜀ, corresponding to "a"

   The name of the Latin-script letter A/a.

   contraction of àwa á (“We'll”)

   contraction of òun á (“He'll, she'll, it'll”)

   Source: wiktionary.org