Where does “reactionless” come from?

reactionless (English) comes from English reäction, from Middle English reaccion, from Old French reaction, from Latin reactio, from Latin reago, from Latin rĕ-, from Latin prōdūcō, from Latin prō- — passed , crossed.

reactionless (English): Devoid of reactions; not reacting

Definitions

  1. Devoid of reactions; not reacting

Ancestry of “reactionless”, step by step

reactionless traces back through two separate lines of ancestry.

via English reäction

StepLanguageWordMeaning
1EnglishreäctionRare spelling of reaction
2Middle Englishreaccionreaction
3Old Frenchreaction
4Latinreactioreaction
5LatinreagoI act upon again, I do again; I react
6Latinrĕ-back, backwards
7Latinprōdūcōto lead or bring forth, forward or out
8Latinprō-forward direction, forward movement
9Proto-Italic*pro-pro- see the Latin entry for further meanings
10Proto-Indo-Europeanpro-toward, forward
11Proto-Indo-Europeanpor-to give birth; forward, through; going, passage
12Proto-Indo-Europeanper-before, in front; first; to go through
13Proto-Indo-Europeanpr̥tóspassed , crossed

via English less

StepLanguageWordMeaning
1EnglishlessTo a smaller extent or degree; comparative form...
2Middle Englishlesfalse; lying; deceptive; falsehood; a lie
3Old Englishlēasfalse, lax; false, void, loose; devoid of, loose...
4Proto-Germanic*laus

Words derived from “reactionless

Every word from Proto-Indo-European pr̥tós