Definition: lambda

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Source: WordNet (r) 1.7 

lambda
     n 1: the 11th letter of the Greek alphabet
     2: the craniometric point at the junction of the sagittal and
        lamboid sutures of the skull

Source: Webster's Revised Unabridged Dictionary (1913) 

Lambda \Lamb"da\, n. [NL., fr. Gr. ?.]
   1. The name of the Greek letter [Lambda], [lambda],
      corresponding with the English letter L, l.

   2. (Anat.) The point of junction of the sagittal and lambdoid
      sutures of the skull.

   Lambda moth (Zo["o]l.), a moth so called from a mark on its
      wings, resembling the Greek letter lambda ([Lambda]).

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

LAMBDA

   A version of typed lambda-calculus, used to describe
   semantic domains.

   ["Outline of a Mathematical Theory of Computation",
   D.S. Scott, TM PRG-2, PRG, Oxford U, 1971].