# egression
## English
### Etymology

From Latin ēgressiō.

### Pronunciation

* IPA: /ɪˈɡɹɛʃən/

### Noun

egression (plural egressions)
* The act of going; egress.
** 1616, Ben Jonson, The Devil Is an Ass:That so thou mayest have a triumphal egression
** 1651–1653, Jer[emy] Taylor, ΕΝΙΑΥΤΟΣ [Eniautos]. A Course of Sermons for All the Sundays of the Year. […], 2nd edition, London: […] Richard Royston […], published 1655, →OCLC:Such things as these which are extraordinary egressions and transvolations beyond the ordinary course of an even piety, God loves to reward with an extraordinary favour […]
** 1977, Edwin Shneidman, Definition of Suicide, page 144:Suicide is the ultimate egression, besides which running away from home, quitting a job, deserting an army, leaving a spouse, seem to pale.
** 1995, Charles J. Bolender, Extraction Versus Nonextraction, page 61:Because of molar egression and incisor ingression in the lower jaw, an analogous tipping of the lower occlusal plane will occur.
* (physics) A calculated version of the wave field that emanated from a specified location at a specified time.
** 2008, Laurent Gizon, Paul S. Cally, John Leibacher, Helioseismology, Asteroseismology, and MHD Connections, page 344:The egression (H+ ) is simply the time reverse of Equation (1).
** 2011, Freddy Monroy, Holography: Different Fields of Application, page 84:Similarly applied to the acoustic egression, <[H+(r,t)]$^2$>, the result is an "egression-power map".
** 2012, A.-C. Donea, C. Lindsey, D.C. Braun, “Stochastic Seismic Emission from Acoustic Glories and the Quiet Sun”, in Zdenek Svestka, John W. Harvey, editor, Helioseismic Diagnostics of Solar Convection and Activity, page 326:The difference between the egression power plots representing the acoustic glory and those representing the quiet Sun are fairly conspicuous.
** 2012, Valentina Zharkova, Electron and Proton Kinetics and Dynamics in Flaring Atmospheres:We are not able to reliably identify with the TD method any visible acoustic sources at the southern egression source locations 1 and 2, perhaps due to different physical conditions in these locations and the strong transient magnetic field variations and atmospheric contribution present in the GONG velocity observations.
* (paleobiology) The location of a feature on an ammonite fossil outward from the line of the shell's spiral.
** 1899, Memoirs of the Geological Survey of India, page 11:The reason for this lies in the fact that a wide-shell-band, running along the margin of the egression, is superposed directly upon the shell of the preceding whorl.
** 2015, Christian Klug, Dieter Korn, Kenneth De Baets, Ammonoid Paleobiology: From anatomy to ecology, page 288:According to Klinger and Kennedy (1989), the hoplitoidean Placenticeras kaffarium displays a rather strong umbilical egression, which gives it a scaphitoid adult morphology.
** 2012, Reinhart A. Gygi, Quantitative Geology of Late Jurassic Epicontinental Sediments in the Jura Mountains of Switzerland, page 66:Egression of the umbilical suture line on the last whorl of an adult and complete speciment is one morphologic feature which is unambiguous evidence of maturity in ammonites.
* (sociology, systems theory) A centralized or top-down organization.
** 1980, Aleksandr Bogdanov, Essays in Tektology, page 169:Experience and the will of one person were becoming an increasingly more determining moment in the practice of the entire collective: a stable egression was developing.
** 2018, James White, Red Hamlet, page 305:The most obvious example of egression was the relationship of the brain to the sensory organs and other nerve centres of the body.
** 2022, Boris Groys, Philosophy of Care, page 93:In machine production a new link of egression –a mechanism –is introduced between the hand of man and the working tool. Thus, a new broadening of egression is also achieved, and quite a significant one at that: the mechanism is free from the biological limitation of organs of the body and can control at the same time an indefinitely large number of instruments.
* (law) A legitimate implication an existing law.
** 1982, University of Detroit Journal of Urban Law - Volume 60, page 260:This conclusion is an egression from federalism principles.
** 2023, Niccolò Machiavelli, James Allen, William Walker Atkinson, The Science of Prosperity:The tenet, accordingly, has some claim to stand as an egression of "natural" right, even when "natural" is taken in an evolutionary sense.

#### Derived terms

* egressive

### Anagrams

* ergosines