1. ある物体を別の物体にこすりつけることに使われる努力(effort expended in moving one object over another with pressure)
2. 何かの上に紙をおいてそれを木炭でこすって作る(彫ってあるものの)複写(representation consisting of a copy (as of an engraving) made by laying paper over something and rubbing it with charcoal)
3. ある物体が他と触れて動かされた時に生じる抗力(the resistance encountered when one body is moved in contact with another)