The Collaborative International Dictionary of English v.0.48:

Pipit \Pip"it\, n. [So named from its call note.] (Zool.)
   Any one of numerous species of small singing birds belonging
   to Anthus and allied genera, of the family
   Motacillid[ae]. They strongly resemble the true larks in
   habits, colors, and the great length of the hind claw. They
   are, therefore, often called titlarks, and pipit larks.
   [1913 Webster]

   Note: The meadow pipit (Anthus pratensis); the tree
         pipit, or tree lark (Anthus trivialis); and the
         rock pipit, or sea lark (Anthus obscurus) are
         well-known European species. The common American pipit,
         or brown lark, is Anthus Pensilvanicus. The Western
         species (Anthus Spraguei) is called the American
         skylark, on account of its musical powers.
         [1913 Webster]

WordNet (r) 3.0 (2006):

pipit
    n 1: a songbird that lives mainly on the ground in open country;
         has streaky brown plumage [syn: pipit, titlark, lark]