The Collaborative International Dictionary of English v.0.48:

Ferry \Fer"ry\ (f[e^]r"r[y^]), v. t. [imp. & p. p. Ferried
   (-r[i^]d); p. pr. & vb. n. Ferrying.] [OE. ferien to
   convey, AS. ferian, from faran to go; akin to Icel. ferja to
   ferry, Goth. farjan to sail. See Fare.]
   1. To carry or transport over a river, strait, or other
      narrow water, in a boat.
      [1913 Webster]

   2. To convey back and forth regularly between two points in a
      vehicle; as, part of her day was spent ferrying the kids
      to and from school.
      [PJC]

WordNet (r) 3.0 (2006):

ferrying
    n 1: transport by boat or aircraft [syn: ferry, ferrying]