Logic.
a definition in which the definiendum (the expression being defined) or a variant of it appears in the definiens (the expression that defines it).
Logic.
a definition in which the definiendum (the expression being defined) or a variant of it appears in the definiens (the expression that defines it).
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012