11. A computer program product comprising a computer readable storage medium having a computer readable program stored therein, wherein the computer readable program, when executed on a computing device, causes the computing device to implement a natural language content (NLC) disambiguation engine, that operates to: identify, in a corpus of natural language content, a portion of natural language content (NLC) that is determined to be ambiguous with regard to a context of the portion of NLC, thereby identifying an ambiguous content portion; compare the ambiguous content portion to private content information associated with a source of the ambiguous content portion, wherein the private content information is content information accessible to users and resources associated with the source and is not accessible to users or resources that are not associated with the source; identify a domain of the ambiguous content portion based on a domain of a matching portion of the private content information; and perform a clarifying operation that clarifies the ambiguous content portion based on the identified domain of the ambiguous content portion to thereby generate a clarified content portion for processing by a cognitive operation of a cognitive system.
19. The computer program product of claim 11 , wherein the portion of NLC comprises a portion of natural language content of a corpus of natural language content ingested into a cognitive system, and wherein the cognitive operation is one of a cognitive search operation for searching for matching natural language content to a search request submitted to the cognitive system or a cognitive question answering operation for generating a natural language answer to a input natural language question.