friction
(noun)
noun
1. a state of conflict between persons
Similar word(s): clash
Definition categories: state, conflict
2. the resistance encountered when one body is moved in contact with another
Similar word(s): rubbing
Definition categories: phenomenon, resistance
3. effort expended in moving one object over another with pressure
Similar word(s): detrition, rubbing
Definition categories: act, effort, exertion, sweat, travail