19. The system of claim 16 , the logic configured to identify the one or more sets of conceptually similar terms for the each graph term by: determining a semantic sense for a search query concept of the search query; and identifying the one or more sets of conceptually similar terms in accordance with the semantic sense.
16. A system comprising: a computer system comprising a processor and memory, the memory configured to store a search query expressed as a query conceptual graph; and logic stored in one or more tangible media and when executed by the computer system, the logic is configured to: determine a plurality of documents that satisfy the search query; perform the following for each document of the plurality of documents to identify one or more sets of conceptually similar terms for each document: generate a document conceptual graph for each document, the document conceptual graph comprising: a plurality of graph terms, a graph term representing a concept type; a plurality of conceptual relation nodes that each comprise text describing a relationship between two or more of the plurality of graph terms; and a plurality of arcs that each indicate a direction of the relationship described by the text of a corresponding conceptual relation node of the plurality of conceptual relation nodes; identify one or more sets of conceptually similar terms for each graph term of the document conceptual graph, the one or more sets of conceptually similar terms mapped to the concept type represented by each graph term; select a document as a potential match if one or more terms of the one or more sets of conceptually similar terms for the document match one or more terms associated with the query conceptual graph; access one or more onomasticons, each onomasticon comprising a list of one or more mappings, each mapping comprising a mapping of a predetermined concept type to a corresponding set of conceptually similar terms; and validate that the potential match is a valid match if one or more of the sets of conceptually similar terms a set of conceptually similar terms of the query conceptual graph, and a set of conceptually similar terms of the document conceptual graph that is associated with the potentially matching document, maps to the same concept type in one or more onomasticons.