Sentence:  From these results , one sees that the study of linear operators on vector spaces over an algebraically closed <WSD>field</WSD> is essentially reduced to the study of nilpotent operators . 
Meaning of the word marked with <WSD> tags:  (mathematics) a set of elements such that addition and multiplication are commutative and associative and multiplication is distributive over addition and there are two elements 0 and 1