1. subject index science> An information resource that contains references to other resources, categorised by subject, usually in a hierarchy. Yahoo is the most popular Internet subject index. Like most other subject indices http://www. yahoo. com/Computers_and_Internet/Internet/World_Wi Yahoo is arranged ontologically. Subject indices are not to be confused with search engines, which are based not on subject, but instead on relevance, although 1 this difference is often possibly rightly hidden from the unsophisticated user, and 2 future integration of knowledge representation into relevance ranking algorithms will make this a hazy distinction.
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