What is mean by rework,redesign,reconndition

Rework refers to any work that is performed to correct defects.

Redesign refres to design anew, make a new design for.

Recondition is to bring into an improved condition; ''He reconditioned the old appliances''

rework is like do it again or do over
redesign is design again,
reconditioned means it was broke and it has been fixed for resale.
That is the simplest way l could think of explaining

use something old, and restore, modify and make like new again.