InfoPlease

Dictionary.com

dictionary.com

Encyclopædia Britannica

britannica.com

wikiHow

wikihow.com

Collins Dictionary

collinsdictionary.com

The World Factbook

cia.gov

Kiddle

kiddle.co

Our World in Data

ourworldindata.org

YourDictionary

yourdictionary.com

Etymonline

etymonline.com

World History Encyclopedia

worldhistory.org

Interesting Facts

interestingfacts.com

FP Notebook

fpnotebook.com

Techopedia

techopedia.com

Ballotpedia

ballotpedia.org

Stanford Encyclopedia of Philosophy

plato.stanford.edu

HowStuffWorks

howstuffworks.com

IEP

iep.utm.edu

Snopes.com

snopes.com

네이버 지식백과

terms.naver.com

Metapedia

metapedia.org

BabelNet

babelnet.org

Coinpedia

coinpedia.org

References.net

references.net

InfoBaseAI

infobaseai.com