The Collaborative International Dictionary of English v.0.48:

Intersperse \In`ter*sperse"\, v. t. [imp. & p. p.
   Interspersed; p. pr. & vb. n. Interspersing.] [L.
   interspersus interspersed; inter between, among + spargere to
   scatter. See Sparse.]
   [1913 Webster]
   1. To scatter or set here and there among other things; to
      insert at intervals; as, to intersperse pictures in a
      book.
      [1913 Webster]

            There, interspersed in lawns and op'ning glades,
            Thin trees arise that shun each other's shades.
                                                  --Pope.
      [1913 Webster]

   2. To diversify or adorn with things set or scattered at
      intervals; to place something at intervals in or among;
      as, to intersperse a book with pictures.
      [1913 Webster]

            Which space is interspersed with small islands and
            rock.                                 --Cook.
      [1913 Webster]

WordNet (r) 3.0 (2006):

intersperse
    v 1: place at intervals in or among; "intersperse exclamation
         marks in the text"
    2: introduce one's writing or speech with certain expressions
       [syn: intersperse, interlard]