wacen
This might be just a supplemental entry adding to an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
wacen
. I. add: I a. intentional wakefulness, vigilance, v. wacung. II. AddMid þý Benedictus behogode þá tíde þæs nihtlican gebedes, hé gefealh his wæcce (wacone, v.l.) (instans vigiliis), Gr. D. 170, 30. Hé hine sylfne band mid mycclum fæstenum and wacenum, 19. Wacona vigilias, Ps. Vos. 76, 5.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.