Also found in: Thesaurus, Medical, Legal, Financial, Encyclopedia.
Related to accretionary: accretionary growth, accretionary prism


a. Growth or increase in size by gradual external addition, fusion, or inclusion.
b. Something contributing to such growth or increase: "the accretions of paint that had buried the door's details like snow" (Christopher Andreae).
2. Biology The growing together or adherence of parts that are normally separate.
3. Geology
a. Slow addition to land by deposition of water-borne sediment.
b. An increase of land along the shores of a body of water, as by alluvial deposit.
4. Astronomy An increase in the mass of a celestial object by its gravitational capture of surrounding interstellar material.

[Latin accrētiō, accrētiōn-, from accrētus, past participle of accrēscere, to grow; see accrue.]

ac·cre′tion·ar′y (-shə-nĕr′ē), ac·cre′tive adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.accretionary - marked or produced by accretionaccretionary - marked or produced by accretion  
increasing - becoming greater or larger; "increasing prices"
Mentioned in ?
References in periodicals archive ?
Stromatolites are attached laminated, Sedimentary growth structure accretionary away from a point of initiation , And their morphological comparison with actual structure prevail for assessing the microbial origin of ancient stromatolite in the geological record.
At ODP Hole 808 (32[degrees]21'N, 134[degrees]57'E; depth = 4675 m) along the Nankai Trough accretionary prism, an averaged silicate concentration of 710 [+ or -] 190[micro]mol/kg, significantly higher than the bottom seawater value of 150 [micro]mol/kg, was detected in porewaters of the surface sediment between 3 and 348m below the seafloor (mbsf).
Subsequent Acadian tectonism and magmatism in southwestern New Brunswick is attributable to accretionary events associated with closure of the Acadian Seaway by northwest-directed subduction beneath the Kingston arc-Mascarene backarc system and its St.
It is a complex system of thrusts in the suture area of the Lugodanubicum and the Brunovistulicum whose oblique collision identifies a specific formation way of the Variscan accretionary wedge.
Sandstone detrital modes in the Makran accretionary wedge, southwest Pakistan: Implications for tectonic setting and long-distance turbidite transportation.
Neoproterozoic accretionary tectonics along the northwestern margin of the Yangtze Block, China: constraints from zircon U--Pb geochronology and geochemistry.
In larger specimens, the shell may reach over 6 cm in length (Hunt, 1877), and shows accretionary growth bands analogous to those seen on the shelves of bivalves or other molluscs (e.
Offshore Palawan it has been interpreted as an accretionary prism that has been preserved in place when subduction ceased in the Middle Miocene.
Cawood, "Metallogeny of accretionary orogens--the connection between lithospheric processes and metal endowment," Ore Geology Reviews, vol.
The topics include the tectonic zoning of the Early Precambrian crust of the East European Platform, late paleo-Proterozoic Lapland to Mid-Russia to South Baltia intracontinental collisional orogen, late paleo-Proterozoic Svecofennian accretionary orogen, and a synthesis of the three-dimensional deep structure of the Early Precambrian crust in the East European craton.
2002) emphasized the temporal relationship/correlation between the accretionary growth of Baltica towards the present west and episodic pulses of rapakivi magmatism, which were accommodated in discrete N-S-trending belts younging towards the southwest.