tectono-eustasy (tec'-ton-o-eu'-sta-sy). Worldwide change of sea level produced by a change in the capacity of the ocean basins owing to plate tectonic motions, e.g. sea-floor spreading, subduction. Term introduced by Fairbridge (1961, p.111). Cf: glacio-eustasy; sedimento-eustasy. Syn: diastrophic eustatism; tectono-eustatism.