Abiding

google

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Old English ābīdan ‘wait’, from ā- ‘onwards’ + bīdan (see bide).

wiktionary

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Present participle or  participial adjective from  abide(verb) +‎  -ing; or, from Middle English participle form of  abiden,  abyden(“to abide”). 

From Middle English abydynge, abidynge, -inge [ verbal noun of abiden, abyden(“to abide”)], [2] from Old English abīdung [3]; or, verbal noun from abide(verb) +‎ -ing.

etymonline

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abiding (adj.)

late 14c., "enduring, steadfast," present-participle adjective from abide (v.). Related: Abidingly.