All 3 Uses of

partition
in
The Fountainhead

It meant days of tearing down floors, stairways, partitions already erected; it meant extras piling up on the contractor's budget.†
Chpt 1.13 *

He got a few jobs, remodeling rooming houses, an assignment that involved no more than erecting partitions and rearranging the plumbing.†
Chpt 2.15

The ceilings were pre-cast; the inner walls were of plastic tile that required no painting or plastering; all pipes and wires were laid out in metal ducts at the edge of the floors, to be opened and replaced, when necessary, without costly demolition; the kitchens and bathrooms were prefabricated as complete units; the inner partitions were of light metal that could be folded into the walls to provide one large room or pulled out to divide it; there were few halls or lobbies to clean, a minimum of cost and labor required for the maintenance of the place.†
Chpt 4.9

Definition:

to divide something into parts; or a divider itself, or one of the sections created