21. The search system of claim 19 , wherein said query processing module retrieves said plurality of available alternative terms from said database.
19. A search system for searching for electronic documents, and providing a search result in response to a search query, comprising: a processor; a database, wherein terms in the database are grouped in a cluster based on the terms belonging to a same word sense; a user interface module adapted to receive a search query from a user, said search query having at least one search query term; a query processing module that automatically determines a single assumed domain category for the at least one search query term selected form a group of retrieved domain categories, and wherein said user interface module is adapted to display alternative domain categories in which said search query term is used that are different from and exclusive of the single assumed domain category, and to allow the user to select at least one of the alternative domain categories, and wherein the query processing module identifies a plurality of any available alternative terms from a cluster based on the domain category selected by the user, and wherein the plurality of any available alternative terms include any available synonyms within the domain category selected by the user; a search engine that electronically searches for electronic documents that satisfy said at least one search query term and said plurality of available alternative terms; and wherein said user interface module is further adapted to display search results received from the search engine.