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The Collaborative International Dictionary
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.

Wiktionary
in gross

alt. roughly; approximately; generally; without going into details. prep.phr. roughly; approximately; generally; without going into details.