Excerpt
In corpus linguistics, a hapax
legomenon (/ˈhæpəks lɨˈɡɒmɨnɒn/ also /ˈhæpæks/ or /ˈheɪpæks/;[1][2] pl. hapax legomena;
sometimes abbreviated to hapax, pl. hapaxes) is a word that occurs only once within a
context, either in the written record of an entire language, in the works of an author, or
in a single text. The term is sometimes incorrectly used to describe a word that occurs in
just one of an author's works, even though it occurs more than once in that work. Hapax
legomenon is a transliteration of Greek ἅπαξ λεγόμενον, meaning "(something) said (only)
once".[3]