Merriam-webster

Merriam-Webster is a dictionary website based in the United States, offering definitions, spelling, pronunciation and a thesaurus for English words. Visitors look up individual words, browse a word-of-the-day feature, and read articles explaining word origins, usage questions and language trends. The site is used as a reference by students, writers and general readers checking meaning, spelling or usage in English.

Its ads.txt file lists 72 ad systems, 47 declared as direct sellers and 50 as resellers, with advertising sold in part through the sales house CMI Marketing, Inc. d/b/a Raptive.