There are 2 definitions of AA in English:

AA

Line breaks: AA
Pronunciation: /eɪˈeɪ
 
/

abbreviation

  • 1Alcoholics Anonymous.
  • 1.1Anti-aircraft.
  • 1.2(In the UK and South Africa) Automobile Association.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space

There are 2 definitions of AA in English:

aa

Line breaks: aa
Pronunciation: /ˈɑːɑː
 
/

noun

[mass noun] Geology
  • Basaltic lava forming very rough, jagged masses with a light frothy texture. Often contrasted with pahoehoe.
    More example sentences
    • Roads of black ash traverse it, winding through the otherwise untraversable aa.
    • A serpentine flow meanders through formations of smooth pahoehoe lava and rough aa lava, the same forms common in basalt lavas.
    • Very different from jagged aa, pahoehoe is the other general texture of newly solidified lava.

Origin

mid 19th century: from Hawaiian 'a-'a.

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