A grip in which the racket is rotated slightly toward backhand and the the thumb is upward on the back of the racket. This becomes the classic grip used for backhand work when rackets were relatively [..]

An outright point from a serve that is not even touched by the receiver. Archaically "ace" was used to mean any point scored.

"A stroke in which the air- not the shuttle- is hit. It is usually caused by the player taking his eye off the shuttle just before impact or by very poor hand-eye coordination." (1)

(Side Alley)

The angle of the trajectory of the shuttle upon leaving one's racket. A steep angle means sharply downward and a flat angle is closer to horizontal. Where this becomes important is for attacking [..]

Back third of the court, in the area of the back boundary lines. See also Midcourt

For court position, the opposite side of the body from the player's racket hand. For strokes, any shot hit with the back of the racket, which is the side of the racket facing toward the racket ha [..]

The movement of the racket backwards (away from shuttle) to prepare for a forward swing (toward the shuttle).

The center of mass of the racket, as measured from the bottom of the grip. The higher this number the more head-heavy the racket is. Typical balance point is around 300mm. Note that this is often quot [..]

(Center Position)