The Collaborative International Dictionary of English v.0.48:

Enlargement \En*large"ment\, n.
   1. The act of increasing in size or bulk, real or apparent;
      the state of being increased; augmentation; further
      extension; expansion.
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   2. Expansion or extension, as of the powers of the mind;
      ennoblement, as of the feelings and character; as, an
      enlargement of views, of knowledge, of affection.
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   3. A setting at large, or being set at large; release from
      confinement, servitude, or distress; liberty.
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            Give enlargement to the swain.        --Shak.
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   4. Diffusiveness of speech or writing; expatiation; a wide
      range of discourse or argument.
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            An enlargement upon the vices and corruptions that
            were got into the army.               --Clarendon.
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WordNet (r) 3.0 (2006):

enlargement
    n 1: the act of increasing (something) in size or volume or
         quantity or scope [syn: expansion, enlargement] [ant:
         contraction]
    2: the state of being enlarged
    3: a discussion that provides additional information [syn:
       expansion, enlargement, elaboration]
    4: a photographic print that has been enlarged [syn:
       enlargement, blowup, magnification]