planationn.

Brit.

/pləˈneɪʃn/,

/pleɪˈneɪʃn/, U.S.

/pləˈneɪʃ(ə)n/,

/pleɪˈneɪʃ(ə)n/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin plānum , -ation suffix.

Etymology: < classical Latin plānum plane n.³ + -ation suffix. Compare post-classical Latin planatio levelling of ground (1490, 1499 in British sources).

Geomorphology.

The levelling of a landscape by erosion; (occasionally) an instance of this.

ΘΚΠ

the world > the earth > structure of the earth > formation of features > erosion or weathering > [noun] > erosion of specific features

planation1877

lateritization1882

wedging1882

laterization1890

peneplanation1899

overdeepening1901

karsting1921

laterizing1929

panplanation1933

pedimentation1940

pediplanation1942

karstification1958

1877 G. K. Gilbert Rep. Geol. Henry Mts. (U.S. Geogr. & Geol. Surv. Rocky Mt. Region) 127 The process of carving away the rock so as to produce an even surface, and at the same time covering it with an alluvial deposit, is the process of planation.

1935 Geogr. Jrnl. 85 171 It is only where planation occurred during the subsequent Jurassic submergence that the surface is really level, as on the Mendips.

1963 D. W. Humphries & E. E. Humphries tr. H. Termier & G. Termier Erosion & Sedimentation ii. 35 The most perfect planations imply a succession of complex phenomena, which include transportation and deposition of sediments as well as erosion.

1976 A. N. Strahler Princ. Earth Sci. xiv. 208/1 The floodplain is widened by further lateral planation.

1991 R. Goldring Fossils in Field ii. 21 In some cases a faunal continuum can be demonstrated, reflecting the gradual change in cohesiveness of the seafloor and its planation by sand under wave action.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	planation
释义	planationn. Brit. /pləˈneɪʃn/, /pleɪˈneɪʃn/, U.S. /pləˈneɪʃ(ə)n/, /pleɪˈneɪʃ(ə)n/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin plānum , -ation suffix. Etymology: < classical Latin plānum plane n.³ + -ation suffix. Compare post-classical Latin planatio levelling of ground (1490, 1499 in British sources). Geomorphology. The levelling of a landscape by erosion; (occasionally) an instance of this. ΘΚΠ the world > the earth > structure of the earth > formation of features > erosion or weathering > [noun] > erosion of specific features planation1877 lateritization1882 wedging1882 laterization1890 peneplanation1899 overdeepening1901 karsting1921 laterizing1929 panplanation1933 pedimentation1940 pediplanation1942 karstification1958 1877 G. K. Gilbert Rep. Geol. Henry Mts. (U.S. Geogr. & Geol. Surv. Rocky Mt. Region) 127 The process of carving away the rock so as to produce an even surface, and at the same time covering it with an alluvial deposit, is the process of planation. 1935 Geogr. Jrnl. 85 171 It is only where planation occurred during the subsequent Jurassic submergence that the surface is really level, as on the Mendips. 1963 D. W. Humphries & E. E. Humphries tr. H. Termier & G. Termier Erosion & Sedimentation ii. 35 The most perfect planations imply a succession of complex phenomena, which include transportation and deposition of sediments as well as erosion. 1976 A. N. Strahler Princ. Earth Sci. xiv. 208/1 The floodplain is widened by further lateral planation. 1991 R. Goldring Fossils in Field ii. 21 In some cases a faunal continuum can be demonstrated, reflecting the gradual change in cohesiveness of the seafloor and its planation by sand under wave action. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1877
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