cognominal

adj

1. (not-comparable)Of or relating to a cognomen.
2. (not-comparable)Bearing the same name.

   “... is the pole cognominal with the pole of the magnet; and inasmuch as the cognominal poles of magnets repel each other, so are we to conceive this one also as repelled by the pole of the magnet.”

   “Divide any arc of revolution into 90 equal parts from the terminus of the arcs of revolution to the pole; for whatever the degree of latitude of the place, that part of the arc of revolution is to be reckoned as cognominal to it which the magnetic pole in rotating upon or around terrella or earth regards: in the large diagram that follows, this is indicated by the right lines.”

   “the fact that the two men are cognominal is a mere coincidence.”

   “My cognomen is Whitehouse, or wise guy, and I am formally cognominal with the residence of some who is not so wise.”

noun

1. A name (sometimes especially one's cognomen or family name).

   “[…] Mr. Diedrich Knickerbocker, a name not yet ranked with Hume, and Gibbon, and Robertson, very fortunately for those who have an antipathy to Dutch cognominals, but which, we venture to foretel, will be held in esteem,”

   “POSY MAY: (Grins at HESTER.) I was borned in May, de month of posies. My full cognominal is Posy May Purdy.”

2. (obsolete)One bearing the same name.

   “And therefore although it be not denied that ſome in the water doe carry a juſtifiable reſemblance to ſome at the Land, yet are the major part which beare their names unlike; nor doe they otherwiſe reſemble the creatures on earth, then they on earth the conſtellations which paſſe under animall names in heaven: nor the Dog-fiſh at ſea much more make out the Dog of the land, then that his cognominall or name-ſake in the heavens.”

   “Different-named Fractions, reduced to cognominals, or Same-named [Fractions], and withall added and Subducted.”