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extra-essential
extra-essential adj.
Brit. 
/ˌɛkstrə(r)ᵻˈsɛnʃl/
, /ˌɛkstrə(r)ᵻˈsɛnʃl/U.S. /ˌɛkstrəəˈsɛn(t)ʃəl/
not included in the essence of some thing. [After post-classical Latin extraessentialis (1628 or earlier).] /ˌɛkstrəəˈsɛn(t)ʃəl/ΘΚΠ
the world > existence and causation > existence > extrinsicality or externality > [adjective] > non-essential
accidental1387
casual1398
incident1523
accidentary?1549
accessarya1555
chanceablea1557
accessory1563
circumstant1583
advenient1594
adventive1605
adventitial1607
circumstantial1608
contingent1628
adventious1633
incidental1644
accessional1646
contingential1647
non-essential1647
extra-essential1667
attachable1798
dividuous1816
inessential1832
peripheral1902
1667 R. Boyle Origine Formes & Qualities (ed. 2) 306 Tis extra-essential to the Form that is said to be previous.
1676 J. Glanvill Ess. vii. 25 They perswaded modestly in all extraessential doctrines.
1823 T. De Quincey Lett. Young Man in London Mag. Mar. 330 Something extra-essential in the philosophy.
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