English
extropy
Extropy comes from Ancient Greek ἐκ ‘Out of, from’, and goes back to Proto-Indo-European *h₁eǵʰs.
- Proto-Indo-Europeanc. 4500–2500 BCE*h₁eǵʰs‘out of’reconstructed
- Proto-Hellenicc. 2200–1600 BCE*eksreconstructed
- Ancient Greekc. 800–300 BCEἐκexas ἐξ‘Out of, from’
- Ancient Greek, derivedc. 800–300 BCEform not named
- Englishearliest quotation 1999extropy
attested reconstructed ? uncertain or disputed
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*h₁eǵʰs‘out of’reconstructed
- Proto-Hellenicc. 2200–1600 BCE*eksreconstructed
- Ancient Greekc. 800–300 BCEἐκexas ἐξ‘Out of, from’
- Ancient Greek, derivedc. 800–300 BCEform not named
- Englishearliest quotation 1999extropy
Earliest quotation: 1999, Wolfgang Hofkirchner, Psychology Press: “Extropy uptake, extropy output and entropy production. [...] Jin…”
The story
First coined to serve as an antonym of entropy, substituting its en- element (representing the prepositional prefix ἐν (en), en, “in” in its Ancient Greek etymon ἐντροπία (entropía), entropia, “a turning towards”) with ex- (representing the Ancient Greek ἐξ (ex), ex, “out of”, “from”); because ἐξ (ex) takes the form ἐκ (ek) when prefixed to an element beginning with τ (t), the analogical spelling is ectropy (or, alternatively, ektropy), as if after the Ancient Greek *ἐκτροπία (ektropía, “a turning out of”).
Every English word from Proto-Indo-European *h₁eǵʰs
Today it means
noun Negentropy.
Language periods are conventional ranges, not dates for this word.
Etymograph / Proto-Indo-European *h₁eǵʰs / extropy