The definition of ative is relating to or serving to.
An example of ative used as a suffix is in the word informative, which means relating to give information.
of or relating to, serving to, tending to: demonstrative, informative, talkative
Origin of -ativefrom French or L; French -atif, feminine -ative from Classical Latin -ativus
Of, relating to, or associated with: talkative.
Origin of -ativeMiddle English from Old French -atif, -ative from Latin -ātīvus from -ātus past participle suff. ; see -ate 1.