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critical point
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critical angle
crit·i·cal an·gle (plural crit·i·cal an·gles)


noun 
Definition:
 
1. angle producing complete reflection: the angle between a ray of light and a surface at which the ray will be completely reflected by the surface
2. aerospace 
Same as  stalling angle
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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