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ha·pax le·go·me·non | \ ˌha-ˌpaks-li-ˈgä-mə-ˌnän 
, ˌhä-ˌpäks-, -nən \
, ˌhä-ˌpäks-, -nən \ plural hapax legomena\ ˌha-ˌpaks-li-ˈgä-mə-nə , ˌhä-ˌpäks- \
, ˌhä-ˌpäks- \Definition of hapax legomenon
: a word or form occurring only once in a document or corpus
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“Hapax legomenon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hapax%20legomenon. Accessed 28 Feb. 2020.
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The first known use of hapax legomenon was in 1692
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