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SUMMER :
A code or other group or part of a group which has a characteristic
(non-carrying) sum.
SUPER(EN)CIPHERMENT :
The action or process of enciphering a second time a text which is
already enciphered.
SWITCH :
Short for "switch group".
SWITCH GROUP :
Code group indicating from what section of a book have more than one
section, or (occasionally) with which of two or more alternative
meanings, a particular code-group or series of such has been taken
or used.
SYLLABIC :
Consisting of or based on syllables.
SYNOPTIC :
A message containing a weather observation in the International Meteorological
Code made at a synoptic hour.
SYNOPTIC HOUR :
A fixed hour at which meteorological observations are made at all
meteorological stations in a particular area, e.g. Europe, and for
which a separate weather chart is normally drawn. In Europe there are
8 such hours in the 24.
SYNOPTIC PERIOD :
The interval between one synoptic hour and the next.
SYNTHETIC, a :
Produced by combining known code-groups with known subtractor groups,
known code-groups with cipher groups, or known subtractor groups with
cipher groups.
SYNTHETIC, n :
A synthetic subtractor cipher or code group.
SYNTHETIC GROUP :
(esp.) A probable or possible cipher group produced by reciphering a
known good code-group with an already solved subtractor group, with a
view to locating other messages reciphered with this subtractor group.
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