local word-or-list 

Makes the specified variable local to the procedure where local is used. Local can only be used in a procedure. See let, make, and name.

Example: 

to move
local "dist
make "dist 100
fd :dist
end

Try the procedure in the Command Center. The turtle will move. When the procedure is over, check the value of the variables. Variables have lost their values. They don't even exist.

move
show :dist
dist has no value