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definition is
 "it is equal to the resistance of a conductor of unit length and unit area of cross section"
                  formula for resistivity is
ρ= \frac{RA}{l}
here R is resistance of conductor
A is the area of cross section
l is length
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Resistivity known as the power or capacity of material to resist electricity to pass in unit area. 
Formula for that is ρ = RA                                                             

R is the electrical resistance mesure in Ω [ohm]
A is the croos section area of materia 
is the length of the piece of material

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