Sentence:  Fantasy fiction has been categorized and described in different ways. One classification divides fantasy into two major types:¶ low fantasy, which takes place in the primary world (our world);¶ <WSD>high fantasy</WSD>, which takes place in alternative worlds. 
Meaning of the word marked with <WSD> tags:  A subgenre of fantasy fiction set in a secondary world or fantasy world as opposed to the primary world or real world.