Applied to motions, intervals and values that are basically uniform but are made irregular through the action of one or more disturbing factors.
Yenziwe kwiintshukumo, kuphumlo nakwizinto ezinexabiso ezazenziwe kwakuqala ukuba zifane kodwa zenziwa zanxamnye nomthetho kwiintshukumo zezinye okanye ezingaphezulu kwimeko eziphazamisayo