[ ah-ah ]
/ ˈɑ ɑ /
basaltic lava having a rough surface.
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Origin of aa
First recorded in 1855–60, aa is from the Hawaiian word ʿaʿā
Definition for aa (2 of 7)
(in prescriptions) ana2.
Origin of a̅a̅
From the Greek word aná, with superscript bar representing the nasal consonant
Definition for aa (3 of 7)
Definition for aa (4 of 7)
a proportional shoe width size, narrower than A and wider than AAA.
the smallest proportional brassiere cup size.
a quality rating for a corporate or municipal bond, lower than AAA and higher than A.
Electricity. a battery size for 1.5-volt dry cells: diameter, 0.6 inch (1.4 centimeters); length, 2 inches (5 centimeters).
Definition for aa (5 of 7)
author's alteration. Also A.A., AA
Definition for aa (6 of 7)
[ ey-ey ]
/ ˈeɪˈeɪ /
Definition for aa (7 of 7)
Associate in Accounting.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for aa (1 of 3)
/ (ˈɑːɑː) /
a volcanic rock consisting of angular blocks of lava with a very rough surface
Word Origin for aa
British Dictionary definitions for aa (2 of 3)
British Dictionary definitions for aa (3 of 3)
(in Britain) Automobile Association
(in Britain) Advertising Association
(in Britain, formerly) a film that may not be shown publicly to a child under fourteen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for aa
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for aa
[ ä′ä ]
A type of lava having a rough, jagged surface. It is relatively slow moving in its molten state, advancing in the form of massive blocks with fissured and angular surfaces that ride on a viscous interior. The blocks range in size between the size of a football and the size of a house. See Note at pahoehoe.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.