diachronousadj.
/dʌɪˈakrənəs/ 1. Geology. Exhibiting or characteristic of diachronism (see diachronism n. 1); not of a uniform geological age.
ΘΚΠ
the world > the earth > structure of the earth > structural features > [adjective] > relative time
remanié1860
subsequent1889
penecontemporaneous1901
syngenetic1905
juvenile1907
palimpsest1912
diachronous1926
palaeotectonic1947
1926 W. B. Wright in Rep. Brit. Assoc. 1926 355 The Haslingden Flag Marine Band was not contemporaneous in the north-east and south-west..analogous phenomena are demonstrable in almost every highly fossiliferous formation. It is now proposed to introduce the term diachronous to describe a bed having such relations to the zonal succession.
1929 L. J. Wills Physiogr. Evol. Brit. xxiv. 322 The grit facies must therefore transgress the time-zones, i.e. the grits are diachronous.
1966 D. T. Donovan Stratigr. v. 125 There is a recurring tendency among stratigraphers to be alarmed when a formation is discovered to be diachronous.
1969 Proc. Geol. Soc. Aug. 146 Once the marker-points are adequately defined, subsequent demonstrations of facies-changes, diachronous boundaries, lacunae or similar phenomena do not affect their validity.
2. Linguistics. = diachronic adj. 2.
ΘΚΠ
the mind > language > linguistics > other schools of linguistics > [adjective] > synchrony, diacrony, or panchrony
synchronic1922
diachronic1927
panchronic1931
diachronistic1933
diachronous1936
synchronous1936
synchronistic1937
panchronistic1949
synchronical1949
1936 Eng. Stud. 18 93 Since de Saussure and Bally we have learnt to distinguish diachronous and synchronous linguistics.
This entry has not yet been fully updated (first published 1972; most recently modified version published online September 2021).
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adj.1926