Sentence:  In mathematics, a <WSD>Lie algebra</WSD> (pronounced /liː/ "Lee") is a vector space \mathfrak g together with a non-associative, alternating bilinear map \mathfrak g \times \mathfrak g \rightarrow \mathfrak g; (x, y) \mapsto [x, y], called the Lie bracket, satisfying the Jacobi identity. 
Meaning of the word marked with <WSD> tags:  An algebraic structure consisting of a module over a commutative ring (or a vector space over a field) along with an additional binary operation that is bilinear over module (or vector) addition and scalar multiplication.