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aparejo
apart
apartheid
apartment
apartment building
apartment complex
apartment house
apathetic
apathy
apatite
apatosaurus
APB
ape
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apeak
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aperture stop
ap·er·ture stop (plural ap·er·ture stops)


noun 
Definition:
 
photog 
Same as  f-stop
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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