The Collaborative International Dictionary of English v.0.48:

Log \Log\, v. t. [imp. & p. p. Logged; p. pr. & vb. n.
   Logging.]
   1. (Naut.), To enter in a ship's log book; as, to log the
      miles run. --J. F. Cooper.
      [1913 Webster]

   2. To record any event in a logbook, especially an event
      relating to the operation of a machine or device.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Logging \Log"ging\, n.
   The business of felling trees, cutting them into logs, and
   transporting the logs to sawmills or to market.
   [1913 Webster]

WordNet (r) 3.0 (2006):

logging
    n 1: the work of cutting down trees for timber