What is "advowson in gross"

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.

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

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

   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.