ascendancy

English

ascend +‎ -ancy or ascendant +‎ -cy. The use in ecology is due to Robert Ulanowicz.

ascendancy (countable and uncountable, plural ascendancies)

Supremacy; dominant control; the quality of being in the ascendant.
Synonym: superiority
- 2011 January 15, Phil McNulty, “Tottenham 0 - 0 Man Utd”, in BBC‎:
  Spurs ended the half in the ascendancy and Van der Vaart was again inches away from giving them the lead when he met Bale's cross but his header flew wide.
- 2018 July 18, Owen Jones, “The hard right can only be defeated from the left, not from the centre”, in The Guardian‎:
  The Tory hard right is in the ascendancy, and a fascist street movement – led by convicted fraudster Tommy Robinson – represents a growing threat.
(historical, Ireland, sometimes capitalized) A class of Protestant landowners and professionals that dominated political and social life in Ireland up to the early 20th century
- 1975, Terry Eagleton, New Left Review:
  [W. B. Yeats] belonged not to the ascendancy class but to the protestant bourgeoisie.
(ecology) A quantitative attribute of an ecosystem, defined as a function of the ecosystem's trophic network, and intended to indicate its ability to prevail against disturbance by virtue of its combined organization and size. [from 1986]
- 2009, Sven Erik Jørgensen, editor, Ecosystem Ecology, Academic Press, →ISBN, page 63:
  Ascendency was found to be a useful indicator for the health assessment of marine benthic ecosystems over space and time.

supremacy; superiority; dominant control

Azerbaijani: nüfuz (az), zabitə (az)
Bulgarian: надмощие (bg) (nadmoštie), господство (bg) (gospodstvo)
Chinese:
Cantonese: 優勢 (jau¹ sai³), 支配地位 (zi¹ pui³ dei⁶ wai⁶)
Mandarin: 優勢／优势 (zh) (yōushì)
Czech: nadvláda (cs) f, převaha f
Dutch: overwicht (nl), overhand (nl)
Estonian: ülevõim
Finnish: valta-asema (fi)
French: ascendant (fr) m
German: Vormacht (de) f, Vormachtstellung (de) f, Einfluss (de) m, Vorherrschaft (de) f, Überlegenheit (de) f
Hungarian: hatalom (hu), tekintély (hu), uralom (hu)
Icelandic: ofurvald n
Italian: influsso (it) m
Japanese: 優位 (ja) (ゆうい, yūi), 優勢 (ja) (ゆうせい, yūsei)
Korean: please add this translation if you can
Portuguese: ascendência (pt) f
Romanian: superioritate (ro) f, supremație (ro) f, ascendență (ro) f
Russian: госпо́дство (ru) n (gospódstvo), власть (ru) f (vlastʹ), превосхо́дство (ru) n (prevosxódstvo)
Spanish: ascendiente (es) m, predominio (es) m, influencia (es) f, ascendencia (es) f