Hope I don't sound pedantic, but i believe the term is
'stiction'.
Readers with a big shop-bought Dob like my LB 16" may find that the altitude bearings have a little bit too much stiction. These bearings are alloy/felt. I had a lot of annoyance with 'jumping' when trying to get the scope moving up or down, and at anything higher than a 15mm EP, the target would like as not leap out of the field. It was also difficult to position targets at the leading edge of the field so you could watch them as they transit the field.
Step forward
Scotch Invisible Tape. This is a matte-finish tape my daughter uses to mount photos for her Uni work. It has a very silky finish. I taped over the felt pads on the altitude bearings, and there has been a marked improvement in the motion. It doesn't take half as much effort to get the scope going, and I have had no trouble with unwanted movement ( due to the scope being one heavy mutha anyway!) The tape is cheap too, at a few bucks a roll, and if it gets dirty or worn, you can peel it off and add a couple of new strips.