Where does “unreducibleness” come from?

unreducibleness (English) comes from English unreducible, from English reducible, from English reduce, from Old French reducer, from Latin reduco, from English re-, from Middle English re-, from Old French re- — before, in front; first; to go through.

Ancestry of “unreducibleness”, step by step

unreducibleness traces back through two separate lines of ancestry.

via English unreducible

StepLanguageWordMeaning
1EnglishunreducibleNot reducible
2EnglishreducibleCapable of being reduced; Able to be factored...
3EnglishreduceTo bring down the size, quantity, quality, value...
4Old Frenchreducer
5LatinreducoI lead, draw, bring or conduct back; bring or...
6Englishre-again, anew; a completive or intensification of...
7Middle Englishre-
8Old Frenchre-re- again; once more
9Latinrĕ-back, backwards
10Latinprōdūcōto lead or bring forth, forward or out
11Latinprō-forward direction, forward movement
12Proto-Italic*pro-pro- see the Latin entry for further meanings
13Proto-Indo-Europeanpro-toward, forward
14Proto-Indo-Europeanpor-to give birth; forward, through; going, passage
15Proto-Indo-Europeanper-before, in front; first; to go through

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European per-Every word from Latin rĕ-Every word from Proto-Indo-European por-
unreducibleness — Etymology, Origin & Word History | Etymology Explorer