fric ‧ tion /ˈfrɪkʃ ə n/ BrE AmE noun
[ Date: 1500-1600 ; Language: French ; Origin: Latin frictio , from fricare 'to rub' ]
1 . [uncountable and countable] disagreement, angry feelings, or unfriendliness between people SYN tension
Having my mother living with us causes friction at home.
the usual frictions between parents and their teenage children
His independent attitude was a constant source of friction with his boss.
2 . [uncountable] technical the natural force that prevents one surface from sliding easily over another surface:
Putting oil on both surfaces reduces friction.
3 . [uncountable] when one surface rubs against another:
Check your rope frequently, as friction against the rock can wear it away.