ThatQuiz.org is an educational site which schools all over the world use for giving practice tests in diverse subject areas. Although most popular as a site for math testing, tests are also available to help language students increase their vocabulary. Word definitions come from wiktionary.org and fall under the GNU Free Documentation License. ThatQuiz does not review or edit Wiktionary content, although teachers are free to do so. Where not edited by a registered teacher, word definitions appear verbatim as found at Wiktionary, errors and peculiarities included.

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