Noun

(-)

The rubbing of one object or surface against another.

* {{quote-magazine, year=2013, month=July-August, author=(Henry Petroski)

, title= Geothermal Energy , volume=101, issue=4, magazine=(American Scientist) , passage=Energy has seldom been found where we need it when we want it. Ancient nomads, wishing to ward off the evening chill and enjoy a meal around a campfire, had to collect wood and then spend time and effort coaxing the heat of friction out from between sticks to kindle a flame.}}

Conflict, as between persons having dissimilar ideas or interests; clash.

(physics): A force that resists the relative motion or tendency to such motion of two bodies in contact.

* 1839 , (Denison Olmsted), A Compendium of Astronomy Page 95

Secondly, When a body is once in motion it will continue to move forever, unless something stops it. When a ball is struck on the surface of the earth, the friction of the earth and the resistance of the air soon stop its motion.

Noun

(enmities)

The quality of being an enemy; hostile or unfriendly disposition.

* 2005 , .

Some later Muses from Ionia and Sicily reckoned it safest to weave together both versions and say that that which is is both many and one, held together by both enmity and amity.

A state or feeling of opposition, hostility, hatred or animosity.

*

I merely repeat, remember always your duty of enmity towards Man and all his ways.