Sisme

Sisme is a term that may appear in various contexts, but it is most commonly a nonstandard spelling of the French word séisme, which means an earthquake. The correct and widely used spelling in standard French is séisme, with the acute accent on the first e. "Sisme" without diacritics or with altered spelling is generally considered informal or incorrect in formal writing. The appearance of "sisme" often results from typographical errors, non-native typography, or automated text processing.

In linguistics and terminology, there is no recognized concept named "sisme" separate from the seism- root; thus, it does not constitute a distinct term in seismology or earthquake studies. The root "seis-" or "seism-" derives from the Greek seismos "a shaking," which gave rise to words like seismic and seismology.

In some cases, "Sisme" may occur as a proper noun in fictional works, branding, or personal names, but those usages are context-specific and not part of an established field. Because the term lacks a stable definition, most reliable sources treat "sisme" as either a misspelling or a contextual variant rather than a separate entry.

See also: Séisme; Seismic; Seismology; Orthography; Earthquake.