surface resistance to relative motion, as of a body sliding or rolling.

the rubbing of the surface of one body against that of another.

dissension or conflict between persons, nations, etc., because of differing ideas, wishes, etc.

noun

agreement , harmony , peace

noun

abrasion , agitation , attrition , chafing , erosion , filing , fretting , grating , grinding , irritation , massage , rasping , resistance , scraping , soreness , traction , trituration , wearing away , animosity , antagonism , bad blood * , bad feeling , bickering , bone to pick , conflict , counteraction , discontent , discord , disharmony , dispute , dissension , faction , factionalism , flak * , hassle , hatred , hostility , impedance , incompatibility , interference , opposition , quarrel , resentment , rivalry , row * , ruckus * , rumpus * , set-to * , sour note , strife , trouble , wrangling , clash , confrontation , contention , difference , difficulty , disaccord , discordance , dissent , dissentience , dissidence , dissonance , inharmony , schism , variance , war , warfare , clashing , confrication , disagreement , rubbing