Where does “дополнительно” come from?

дополнительно (Russian) comes from Russian дополни́тельный, from Russian допо́лнить, from Russian до-, from Proto-Slavic dȍ, from Proto-Indo-European de — Emphatic or contrastive particle, and, but;...

дополнительно (Russian): additionally, in addition, extra by way of addition

Definitions

  1. additionally, in addition, extra by way of addition

Ancestry of “дополнительно”, step by step

StepLanguageWordMeaning
1Russianдополни́тельныйadditional, supplementary
2Russianдопо́лнитьto supplement, to add, to amplify, to supply, to enlarge, to expand, to complete, to fill up
3Russianдо-up to; completely; pre-, ante-
4Proto-Slavicup to, until
5Proto-Indo-EuropeandeEmphatic or contrastive particle, and, but;...
Every word from Proto-Indo-European deEvery word from Russian до-Every word from Proto-Slavic