Understanding The Technique

A reader recently wrote and asked me if I would write about PIVOTS. Happy to oblige.
First, lets start with the formal definitions.
Alex Moore defines Pivot as:
A turn on the ball of one foot , the other foot being kept in front or behind in C.B.M.P.
The DVIDA manual defines Pivot as:

A turn on the ball [...]

As you recall basic sway is defined in the ISTD manual as follows:
Sway is normally the inclination of the body away from the moving foot and towards the inside of the turn - e.g. step 2 of Waltz Natural Turn.
And the definition I was taught is:
Sway is the natural inclination of the body from [...]