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 : WordNet®

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 : Free On-Line Dictionary of Computing

LAMBDA
     
        A version of {typed lambda-calculus}, used to describe
        semantic {domain}s.
     
        ["Outline of a Mathematical Theory of Computation",
        D.S. Scott, TM PRG-2, PRG, Oxford U, 1971].