An Etymological Dictionary of Astronomy and Astrophysics

1. Involving → addition.
   

2. Something added to a substance to alter or improve it.

Etymology (EN): From L. additivus “added, annexed,” from p.p. stem of addere, → add; → -ive.

Etymology (PE): 1) Related to bardâyeš, → addition; 2) from bardây- prsent stem of bardâyidan, → add,

• -é nuance suffix.