Meaning

noun the prediction that human intelligence and technology will enable life to expand in an orderly way throughout the entire universe

originFirst 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…

Etymology from Wiktionary, CC BY-SA 3.0