The 1944 Bletchley Park Cryptographic Dictionary

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LEVEL, a :

(of message in depth). Beginning at the same point of the key or subtractor.

LEXICON :

(of a system of transposition of the letters in letter-groups). Preserving the order of the letters denoting the margin and those denoting the page respectively, while mixing the two sets together.

LIFE :

Period of currency of a code or cipher system or any part thereof.

LIFETIME :

= life.

LIMITATION :

Characteristic of certain code and cipher systems consisting in the fact that a particular letter or figure (or letters or figures) do not occur, or to not occur in certain positions or certain circumstances or occur less frequently or more frequently than others.

LINE :

A horizontal row of letters or figures, esp. in a Vigenere or similar square.

LINE UP, v :

To set (messages) in depth, especially messages which start level.

LINE-UP, n :

A placing of messages in depth.

LINER :

(in Playfair systems). A bigram both letters of which occur in the same line or row of the square or squares.

LINK :

Regular communication, esp. wireless communication, between two specified points, or facilities for this.

LOBSTER :

(in certain types of Enigma machines). A simultaneous turn-over of all four wheels (i.e. all wheels, including the Umkehrwalze), producing a cipher alphabet which is equal to the previous cipher alphabet unbuttoned one.

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