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nounSynonym of em dash.
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APA
em rule. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/em%20rule
MLA
“em rule.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/em%20rule. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “em rule,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/em%20rule.
Source: em rule on Wiktionary, CC BY-SA 4.0.