redefine

verb

Etymology: From re- + define.

1. To define again or differently.

   “But only if one forgets that Mr. Tester is 50 years old, he’s seasoned in state politics, he ran a canny, gloves-off campaign, and he’s the kind of charismatic, hard-to-peg, Western neopopulist (like his friend, Gov. Brian Schweitzer of Montana) who might be, even now, redefining in certain far-reaching ways what it means to be a Democrat.”

   “Scientists and policy makers from around 60 nations voted unanimously Friday to redefine the kilogram. […] Friday’s vote has permanently redefined the kilogram and sent Le Grand K into retirement.”

2. To define again or differently.
3. To define again or differently.

   “Next the "key redefiner" software came along. These were special programs that could "redefine" the keys on your keyboard , while still permitting you the normal use of the keys.”