egression

From Latin ēgressiō.

• IPA^(key): /ɪˈɡɹɛʃən/

egression (plural egressions)

1. 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.

2. (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.

3. (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.

4. (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.

5. (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.

• ergosines