What does "discreet" mean?

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EdKenobi

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What does "discrete" mean?

In listings for ATC centers, what does "discrete" mean next to the frequency?
 
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Radio99

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Discreet Frequency

From the General Planning Handbook

DISCRETE FREQUENCY

A separate radio frequency for use in direct pilot-controller communications in Air Traffic Control which reduces frequency congestion by controlling the number of aircraft operating on a particular frequency at one time. Discrete frequencies are normally designated for each control sector in enroute/terminal Air Traffic Control facilities. Discrete frequencies are listed in the Airport/Facility Directory, and DoD FLIP IFR Enroute Supplement.
 
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