The real definition Engineering Stress.... A is for AaaRgggggggggggggghhhhhhhhhhhhzzzzzzzzzzzzzzz

B is for Barrggggggggggggghhhhhhhhhhhhhhhhhhhhhhzzzzzz

C is for Caaaaaaarghhhhhhhhhhhhhhzzzzzzzzzzzzzzz

D is for Daaaaaaaaaaaaarrrrrrrgggggghzzzzzzzzzzzzzzzzzzz

E is for EArgggggggghhhhhhhhhhhhhzzzzzzzzzzzzzzzzzz

F is for Faaaaaaaaarrrrrrgggggggggggghhhhhzzzzzzzzzzzz

G is for Gaaaaaarrrrrrrrrrgggggggghhhhhhhzzzzzzzzzzz

You get my point.

Another definition of Engineering stress is Force over original
length since force deforms the material over time, but you still use the original length of the material.