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 (sŏl′ĭ-sĭz′əm, sō′lĭ-)
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.]

sol′e·cist n.
sol′e·cis′tic adj.