adhesion

[ ad-hee-zhuhn ]

noun

1. the act or state of adhering; state of being adhered or united:

   the adhesion of parts united by growth.

2. steady or devoted attachment, support, etc.; adherence.
3. assent; concurrence.
4. Physics. the molecular force of attraction in the area of contact between unlike bodies that acts to hold them together. Compare cohesion ( def 2 ).
5. Pathology.
   1. the abnormal union of adjacent tissues.
   2. the tissue involved.
6. Botany. the union of normally separate parts.
7. Railroads.
   1. the frictional resistance of rails to the tendency of driving wheels to slip.
   2. factor of adhesion.

adhesion

/ ədˈhiːʒən /

noun

1. the quality or condition of sticking together or holding fast
2. ability to make firm contact without skidding or slipping
3. attachment or fidelity, as to a political party, cause, etc
4. an attraction or repulsion between the molecules of unlike substances in contact: distinguished from cohesion
5. pathol abnormal union of structures or parts

adhesion

/ ăd-hē′zhən /

1. The force of attraction that causes two different substances to join. Adhesion causes water to spread out over glass.
2. Compare cohesion
3. A fibrous band of abnormal tissue that binds together tissues that are normally separate. Adhesions form during the healing of some wounds, usually as a result of inflammation.

adhesion

1. The molecular ( see molecule ) attraction that holds the surfaces of two dissimilar substances together. ( Compare cohesion .)

Usage

Adhesion is the preferred term when talking about sticking or holding fast in a physical sense. Adherence is preferred when talking about attachment to a political party, cause, etc

Other Words From

• ad·hesion·al adjective
• nonad·hesion noun

Word History and Origins

Origin of adhesion¹

1615–25; < Medieval Latin adhēsiōn- for Latin adhaesiōn- (stem of adhaesiō ) a clinging, equivalent to adhaes ( us ), past participle of adhaerēre to adhere + -iōn- -ion

Word History and Origins

Origin of adhesion¹

C17: from Latin adhaesiōn- a sticking. See adhere

Example Sentences

It said it had deployed a team of inspectors to the site and on initial inspection found evidence that wheel to rail adhesion was relatively low, suggesting the train may have entered into wheel slide when braking.

From BBC

It said low adhesion would be an area of ongoing investigation.

From BBC

He says: “You have a steel wheel on a steel rail and anything that causes low adhesion can be a big problem.”

From BBC

“The contact size between the wheel and the rails is as small as a 5p piece. So 10 months of the year rail is environmentally friendly because it requires so little energy to move, but then in autumn we have this low adhesion.”

From BBC

The researchers' fruit fly model integrates the numerous signals that orchestrate cell movement, contraction, adhesion and proliferation.

From Science Daily