Question

what is meant by Residue

Answer 1

a small amount of something that remains after the main part has gone or been taken or used.

In mathematics ..

Residue (complex analysis) From Wikipedia, the free encyclopedia. Inmathematics, more specifically complex analysis, the residue is a complex number proportional to the contour integral of a meromorphic function along a path enclosing one of its singularities.

Answer 2

small amount of thing that remain after important part has gone or been taken for use