Meaning
Without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation).
Etymology
Origin: Ancient Greek
19th-century coinage (introduced by W. J. M. Rankine in the 1860s) based on Ancient Greek ἀδιάβατος (adiábatos, “impassable”), used of terrain (rivers, forests) by Xenophon, from ἀ- (a-, “not”) + διά (diá, “through”) + βατός (batós, “passable”), from βαίνω (baínō, “to go”).
Synonyms & Antonyms
Antonyms
diabaticnonadiabatic
NYT Puzzle Appearances
No published puzzle dates on file for this word yet. It is part of the official NYT Spelling Bee word list for 2023, 2025, 2026.