21 AD synonyms, 21 AD antonyms - FreeThesaurus.com
21 (redirected from 21 AD)
Also found in: Dictionary
Synonyms for 21
the cardinal number that is the sum of twenty and one
being one more than twenty
References in periodicals archive
The low-quantity clutter condition had only 21 ads that constituted 30 percent of all pages.
Since there were only 21 ads in the issue, 12 ads meant over 50 percent of the ads were intrusive.