The 1944 Bletchley Park Cryptographic Dictionary

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opposite each. If the code-groups are so assigned that when the plain language elements are in the above order they too are in alphabetical or numerical order (or nearly so), the same book can be used both for encoding and for decoding messages, and it is known as an alphabetic or one-part code; if these conditions are not present a second version of the code having the code- groups in alphabetic or numerical order and their plain language equivalents opposite them is required for decoding, and this is known as a "hatted" or two-part code.

2. A series of groups of the above character, esp. an encoded message.

3. A code-book.

CODE, v :

1. To substitute the equivalent code-groups in a code for corresponding units of plain language; to convert into code; to encode.

2. (misused for to cipher).

CODE-BOOK :

A book containing in a consultable order the words, phrases, sentences, endings, punctuation marks, letters, numbers, etc. used in a particular code with the equivalent code-group opposite each, and if necessary the code-groups also in a consultable form with their plain language equivalent opposite each, used for encoding and decoding messages; (see also code).

CODE-NAME :

A word or letter-group of pronounceable form, indicating a unit, station, department or the like.

CODEWORD :

A word which, when sent as a message, serves to convey a previously arranged meaning, e.g. that an expected situation has arisen or that a particular procedure is to be put into operation.

CODE-TABLE :

A short code in tabular form devised for a special limited purpose.

CODED :

1. Having plain language units replaced by code-groups; encoded.

2. (misused for ciphered).

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