Question

Define the term emasculation

Answer 1

well it depends on in which context you are asking in . in terms of biology it simply mean removal of male reproductive part of orgainism . forexample 
 1  plants it is removal of anther of flower 

Answer 2

emasculation is the process of removing anthers from bisexual flowers without affecting the the female reproductive part (pistil), which is used in various plant hybridization techniques.
it is performed by the plant breeders in bisexual flowers to obtain the desired variety of a plant by crossing a particular plant with the desired pollen grains.
hope this helps u.