I don't have a definition per se, but this discription would suggest what nI always relate to as chipping = notch with impact- ??????
http://www.corrosion.com/prep.asp#SSPC-SP-2Hand Tool Cleaning - Removal of all rust scale, mill scale, loose rust and loose paint to the degree specified by hand wire brushing, hand sanding, hand scraping, hand chipping or other hand impact tools or by a combination of these methods. The substrate should have a faint metallic sheen and also be free of oil, grease, dust, soil, salts and other contaminants.