hapax legomenon

noun

ha·​pax le·​go·​me·​non ˌha-ˌpaks-li-ˈgä-mə-ˌnän 

ˌhä-ˌpäks-,

-nən

plural hapax legomena ˌha-ˌpaks-li-ˈgä-mə-nə 

ˌhä-ˌpäks-

: a word or form occurring only once in a document or corpus

Word History

Etymology

Greek, something said only once

First Known Use

1692, in the meaning defined above