red hat

the broad-brimmed official hat of a Roman Catholic cardinal, symbolic of the office or rank of a cardinal.
a cardinal.
Also called scarlet hat.

1590–1600 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
red hat
1.  the broad-brimmed crimson hat given to cardinals as the symbol of their rank and office
2.  the rank and office of a cardinal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

Red Hat definition

operating system
A distribution of Linux.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
With a red hat which doesn't go, and doesn't suit me.
She wore a red dress and a red hat to protect her eyes from the sun.
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