What's the difference between cognomen and praenomen?
Cognomen
Definition:
(n.) The last of the three names of a person among the ancient Romans, denoting his house or family.
(n.) A surname.
Example Sentences:
(1) Childish amusement in punning on cognomens may be an even greater stimulant for learning than visual configurations or artificial cognitive devices.
(2) The obligate, one-carbon, methane-methanol bacteria are considered as "methyl" utilizers, and the prefix "Methylo-" is suggested as a solution to the problem of generic cognomens.
(3) 1988 marks the centenary of the cognomen "tetralogy of Fallot".
Praenomen
Definition:
(n.) The first name of a person, by which individuals of the same family were distinguished, answering to our Christian name, as Caius, Lucius, Marcus, etc.