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"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.