Meaning of -ATION in English

-ATION

a combination of -ate 1 and -ion , used to form nouns from stems in -ate 1 ( separation ); on this model, used independently to form nouns from stems of other origin: starvation.

[ -ation- (s. of -atio ), equiv. to -a- s. vowel + -tion- -TION ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .