Top Semantic Search Engines

What is semantic search? 
A semantic search engine attempts to make sense of search results based on context. It automatically identifies the concepts structuring the texts. For instance, if you search for “election” a semantic search engine might retrieve documents containing the words “vote,” “campaigning” and “ballot,” even if the word “election” is not found in the source document. Source: Top 5 semantic search engines via Pandia.com.

9 Semantic Search Engines That Will Change the World of Search 
The ideal search engine would be able to match the search queries to the exact context and return results within that context. While Google, Yahoo and Live continue to hold sway in search, here are the engines that take a semantics (meaning) based approach, the end result being more relevant search results which are based on the semantics and meaning of the query, and not dependent upon preset keyword groupings. From Search Engine Journal.

hakia.com
Hakia is a semantic search engine that is focused on quality and elevated user experience. Unique to hakia, a single query brings a full set of results in all segments including Web, news, blogs, hakia galleries, credible sources, video, and images.

SenseBot
SenseBot represents a new type of Search Engine that delivers a summary in response to your search query instead of a collection of links to Web pages. SenseBot parses top results from the Web and prepares a text summary of them. The summary serves as a digest on the topic of your query, blending together the most significant and relevant aspects of the search results. The summary itself becomes the main result of your search.

kngine.com
Kngine is Web 3.0 Search Engine (i.e. revolutionary semantic search engine and question answer engine) designed to provide customized meaningful search result, such as: semantic information about the keyword/concept; answering the user’s questions; lists of things; discovering the relationship between the keywords/concepts; and, linking different kinds of related information together such as: movies, subtitles, photos, price at sale store, user reviews, and influenced stories.

Kosmix
Kosmix filters social media to connect you to content that interests you. It scours the Web to identify interesting social media content, and then organizes it by topic across the engine’s three sites: tweetbeat, RightHealth, and Kosmix.