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Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear audio pronunciations.

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

Watch full episodes of your favorite PBS shows, explore music and the arts, find in-depth news analysis, and more. Home to Antiques Roadshow, Frontline, NOVA, PBS Newshour, Masterpiece and many others.

Airline tickets, flight schedules, and air travel deals to destinations worldwide at Delta.com.

Explore HISTORY shows, watch videos and full episodes, play games and access articles on historical topics at History.com.

Twitter is without a doubt the best way to share and discover what is happening right now.

Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, post links and videos, and learn more about the people ...

The Linda Hall Library Transcontinental Railroad website was created with generous support from the BNSF (Burlington Northern Santa Fe) Foundation. The site offers visitors a brief history of the building of the transcontinental railroad as well as i...

Central Pacific Railroad construction in the 1860

Smart, fun, plain-spoken study guides and teacher resources. Digital textbooks by Ph.D. and Masters students from Stanford, Harvard, Berkeley