solecism: [16] Solecism ‘act of (grammatical) impropriety’ comes via Latin soloecismus from Greek soloikismós, a derivative of sóloikos ‘ungrammatical utterance’. This is said to have referred originally to the speech of Athenian colonists in Soloi, in ancient Cilicia, southern Turkey, held by snooty sophisticates back home in Athens to be a debased form of their own speech.
solecism (n.)
"gross grammatical error;" loosely "any absurdity or incongruity," 1570s, from Middle French solécisme (16c.), from Latin soloecismus "mistake in speaking or writing," from Greek soloikismos "to speak (Greek) incorrectly," from soloikos "ungrammatical utterance," properly "a speaking like the people of Soloi," an Athenian colony in Cilicia (modern Mezitli in Turkey), whose dialect the Athenians considered barbarous. Related: Solecistic.