In a code, a word that consists of a sequence of symbols assembled in accordance with the specific rules of the code and assigned a unique meaning. Note: Examples of code words are error-detecting-or-correcting code words and communication code words, such as SOS, MAYDAY, ROGER, TEN-FOUR, and OUT. 2. A cryptonym used to identify sensitive intelligence data. 3. A word that has been assigned a classification and a classified meaning to safeguard intentions and information regarding a classified plan or operation.