Where does “irreversible” come from?

Irreversible comes from Middle English in- (not), Latin in- (not), Latin in (in), Proto-Indo-European ne (not), Proto-Indo-European oyd- (turn), Proto-Indo-European en (in), and Proto-Indo-European en (in).

irreversible (English): Incapable of being reversed or turned about or...

Definitions

Incapable of being reversed or turned about or...

Ancestry of “irreversible”, step by step

Step	Language	Word	Meaning
1	English	ir-	Used for expressing negation; not
2	Latin	ir-	Alternative form of in-; un-
3	Latin	īn-	un-, non-, not
4	Latin	în	in, at, on, upon, from (space)
5	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
6	Proto-Italic	en	in
7	Proto-Indo-European	h₁én	in

Words derived from “irreversible”

irreversibly
irreversibility
irreversibleness
thermoirreversible

Every word from Proto-Indo-European h₁én →Every word from Latin īn- →Every word from Proto-Italic en →