Pitch adjustment is the whole blade's profile getting angled, so you could have a 9/10 blade with +1 pitch or 9/10 blade with -1 pitch adjustment. Imagine if there was a thin piece of wood put on the heels of your skate boot, and then someone attached the blade holders, that would be positive or aggressive pitch adjusment. If someone put a thin piece of wood on the forefoot area on the bottom of the skate boot and then attached the blade holders, that would be negative pitch. The front half is still 9' profile and the back half is still 10' profile.
Or you can tell your sharpener how your skates feel and how he or she would adjust the pitch.