What is the difference between Resistance and Reactance? What is impedance? What is admittance?

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Resistance:-THE ACTION OF RESISTING.ARMED OR VIOLENT OPPOSITION.SECRET ORGANIZATION RESISTING POLITICAL AUTHORITY.THE ABILITY NOT TO BE AFFECTED BY SOMETHING.

Reactance:-THE NON-RESISTIVE COMPONENT OF IMPEDANCE IN AN AC CIRCUIT,ARISING FROM INDUCTANCE &/OR CAPACITANCE.

Impedance:-THE EFFECTIVE RESISTANCE TO AN ALTERNATING ELECTRIC CURRENT ARISING FROM THE COMBINED EFFECTS OF OHMIC RESISTANCE & REACTANCE.

Admittance:-THE PROCESS OR FACT OF ENTERING OR BEING ALLOWED TO ENTER. A MEASURE OF ELECTRICAL CONDUCTION,NUMERICALLY EQUAL TO THE RECIPROCAL OF THE IMPEDANCE.

what is. pressure ?