Meaning of -ATIVE in English
a combination of -ate 1 and -ive , used to form adjectives from stems in -ate 1 ( regulative ); on this model, because of the frequency and productivity of -ate 1 , used independently to form adjectives from stems of other origin: normative.
[ -ativus, equiv. to -at ( us ) -ATE 1 + -ivus -IVE ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012