The Collaborative International Dictionary of English v.0.48:

Gross \Gross\, n. [F. gros (in sense 1), grosse (in sense 2).
   See Gross, a.]
   1. The main body; the chief part, bulk, or mass. "The gross
      of the enemy." --Addison.
      [1913 Webster]

            For the gross of the people, they are considered as
            a mere herd of cattle.                --Burke.
      [1913 Webster]

   2. sing. & pl. The number of twelve dozen; twelve times
      twelve; as, a gross of bottles; ten gross of pens.
      [1913 Webster]

   Advowson in gross (Law), an advowson belonging to a person,
      and not to a manor.

   A great gross, twelve gross; one hundred and forty-four
      dozen.

   By the gross, by the quantity; at wholesale.

   Common in gross. (Law) See under Common, n.

   In the gross, In gross, in the bulk, or the undivided
      whole; all parts taken together.
      [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

IN GROSS. At large; not appurtenant or appendant, but annexed to a man's
person: e.g. Common granted to a man and his heirs by deed, is common in
gross; or common in gross may be claimed by prescriptive right. 2 Bl. Com.
34.