What? Those definitions are simply false. Incremental steps are small increases or decreases in a quantity, iterative steps are cyclical repetitions of a pattern.

Iterative certainly does not mean "reworking". That's fiction.

http://www.merriam-webster.com/dictionary/incremental

Quote: "of, relating to, being, or occurring in especially small increments <incremental additions> <incremental change>"

http://www.merriam-webster.com/dictionary/iteration

Quote: "a procedure in which repetition of a sequence of operations yields results successively closer to a desired result."

> This is my 5th or 8th attempt to describe the difference between incremental and iterative development.

Have you considered simply looking up the generally accepted meaning of the terms?