Pressure

n. exertion of force, compression, application of weight; weight, burden, encumbrance

v. apply force or weight, push, stress

Pressure (symbol: p) is the force  per unit area  applied on a surface in a direction perpendicular to that surface.Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.Pressure is the amount of force that presses on a certain area. If you make the force on an are bigger, you increase the pressure on the area. Making the area smaller and keeping the force the same also increases the pressure. 08:24, 20 October 2007 (UTC)
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Pressure /pres·sure/ force per unit area. arterial pressure blood p.. blood pressure 1. the pressure of blood against the walls of any blood [more]Pressure - Community and Resources

Noun
1. the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit); "the compressed gas exerts an increased pressure"
(synonym) pressure level, force per unit area
(hypernym) physical phenomenon
(hyponym) blood pressure
(derivation) press
2. a force that compels; "the public brought pressure to bear on the government"
(hypernym) force
(derivation) blackmail, blackjack
3. the act of pressing; the exertion of pressure; "he gave the button a press"; "he used pressure to stop the bleeding"; "at the pressing of a button"
(synonym) press, pressing
(hypernym) push, pushing
(hyponym) impression
(derivation) press
4. the state of urgently demanding notice or attention; "the press of business matters"
(synonym) imperativeness, insistence, insistency, press
(hypernym) urgency
(derivation) blackmail, blackjack
5. the somatic sensation of pressure; "the sensitivity of his skin to pressure and temperature was normal"
(synonym) pressure sensation
(hypernym) somesthesia, somaesthesia, somatesthesia, somatic sensation
6. an oppressive condition of physical or mental or social or economic distress
(hypernym) distress
Verb
1. to cause to do through pressure or necessity, by physical, moral or intellectual means :"She forced him to take a job in the city"; "He squeezed her for information"
(synonym) coerce, hale, squeeze, force
(hypernym) compel, oblige, obligate
(hyponym) turn up the heat, turn up the pressure
(cause) act, move
(derivation) imperativeness, insistence, insistency, press
2. exert pressure on someone through threats
(synonym) blackmail, blackjack
(hypernym) influence, act upon, work

v. pressure, squeeze, exploit, extort