[nunper] (c.1216-20)The form nompere is a cross reference to the following entry:
[ gdw]
The basic (adjectival) sense of this word is ‘peerless, without equal’, hence the adjectival use as ‘single’ to refer to a singular item and the substantival use as ‘arbiter’ to refer to a person who is not equal to others, i.e. has to surpass them.