Question

What do you mean CPCT ( corresponding part of congruent triangle)???

Answer 1

This is term used while proving the congruence of two triangles. 
Example: 
If Three sides of two triangles are equal then all of their angles will also be equal as they will be corresponding past of congruent triangles.

For More Clarity about this concept refer to:
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiE-q3Mou...

Answer 2

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CPCT is corresponding parts of Congruent Triangles. If two triangles are congruent, Their corresponding sides are equal. Their corresponding angles are equal.