n. A division or breaking up into constituent parts, particularly the analytic disassembly of categories which have been aggregated or lumped together.
the GNU version of the Collaborative International Dictionary of English
n. The separation of an aggregate body into its component parts.
The Century Dictionary and Cyclopedia
n. The act or operation of breaking up an aggregate; the state of being disaggregated.
Word Usage
"Yet it has also been on a long-term disaggregation campaign, spinning off its tobacco holdings a dozen years ago and also shedding office products and life insurance divisions."