The Collaborative International Dictionary of English v.0.48:

Groom \Groom\, v. i. [imp. & p. p. Groomed; p. pr. & vb. n.
   Grooming.]
   To tend or care for, or to curry or clean, as a, horse.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

grooming \grooming\ n.
   1. Preparing a person for a position requiring skilled
      behavior, especially by providing opposrtunity for
      practise and guidance in making the right decisions; as,
      to provide grooming for one's successor as president.
      [WordNet sense 1]

   Syn: training, preparation.
        [WordNet 1.5]

   2. The activity of getting dressed, washed and generally of
      neat appearance. [WordNet sense 2]

   Syn: dressing.
        [WordNet 1.5]

   3. The activity of cleaning oneself or others by removing
      lice, ticks, dirt, etc. from the fur; -- of animals.
      [PJC]

WordNet (r) 3.0 (2006):

grooming
    n 1: activity leading to skilled behavior [syn: training,
         preparation, grooming]
    2: the activity of getting dressed; putting on clothes [syn:
       dressing, grooming]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "grooming":
   apprenticeship, basic training, breaking, breeding, conditioning,
   cultivation, development, discipline, drill, drilling, exercise,
   fetching-up, fostering, housebreaking, improvement,
   in-service training, manual training, military training, nurture,
   nurturing, on-the-job training, practice, preparation, raising,
   readying, rearing, rehearsal, sloyd, training, upbringing,
   vocational education, vocational training