en.wikipedia.org
Overview — encyclopedia entry
A general reference article covering background, history and key facts, with links to related topics and sources.
www.collinsdictionary.com
Definition & meaning
Pronunciation, example sentences and usage notes. See the full entry for synonyms and related words.
www.britannica.com
Facts, summary & more
Explore the subject with articles, images and timelines curated by editors and expert contributors.