Dictionaries and Encyclopedia
Encyclopedia Britannica
For more than 250 years, Britannica has kindled the spark of curiosity with stories of discoveries, people and events that changed the world.
Dictionary.com
Dictionary.com is the world’s leading digital dictionary. We provide millions of English definitions, spellings, audio pronunciations, example sentences, and word origins.
Lexico
Lexico is a collaboration with Oxford Dictionary hosted by Dictionary.com offering definitions, meanings, and grammar in both English and Spanish.
World History Encyclopedia
World History Encyclopedia is a non-profit organisation that publishes free, high-quality historical content to advance historical literacy and improve history education worldwide.
Cambridge Dictionary
Cambridge University Press has been publishing dictionaries for learners of English since 1995. Cambridge Dictionaries Online began offering these dictionaries completely free of charge in 1999 — and today, Cambridge Dictionary is still growing.
Macmillan Dictonary
For over 180 years Macmillan’s pioneering spirit and reputation for quality has enabled us to build lasting relationships with teachers and educators around the world.