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1. A nonstandard usage or grammatical construction.
2. A violation of etiquette.
3. An impropriety, mistake, or incongruity.
[Latin soloecismus, from Greek soloikismos, from soloikizein, to speak incorrectly, from soloikos, speaking incorrectly, after Soloi (Soli), an Athenian colony in Cilicia where a dialect regarded as substandard was spoken.]