Hapax

It's difficult to ascertain the meaning of a hapax legomenon.

The word 'Flother' only occurs once in Old English, thus making it a hapax legemenon.

The Assyrian student, moreover, has an advantage which the Hebrew student has not; he possesses dictionaries and vocabularies compiled by the Assyro-Babylonians themselves, and these frequently throw light on a word which otherwise would be a “hapax legomenon.”

Never build a doctrine on or draw a teaching from an unclear or debated hapax.

He includes tables which give the number and frequency of hapaxes in each Book, ...

Most of the hapaxes featuring -ify and -ize are phonologically and semantically transparent, which indicates their status as productive formations.

There are 19000-odd words in his gospel, and 971 of these are hapaxes: there are 18000-odd words in Acts, and 943 are hapaxes.