What is Pressure?

Pressure definition and meaning on Dictionary terms:

the exertion of force upon a surface by an object, fluid, etc., in contact with it: the pressure of earth against a wall.
Physics. force per unit area. Symbol: PCompare stress(def 6).
Meteorology. atmospheric pressure.
Electricity. electromotive force.
the state of being pressed or compressed.
harassment; oppression: the pressures of daily life.
a constraining or compelling force or influence: the social pressures of city life; financial pressure.
urgency, as of affairs or business: He works well under pressure.
Obsolete. that which is impressed.