ǽrendung
This might be just a supplemental entry substituting part of an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
ǽrendung
Substitute: I. carrying a message, acting as an emisary Gif hwylc bróðor gedyrstlǽcð ðæt hé ǽnige geþeódrǽdene nime wið ðone ámánsumedan, oðþe þurh ǽnige sprǽce oðþe þurh ǽniges óþres mannes ǽrendunge (by any other man's carrying a message ), R. Ben. 50, 13. II. a message, an errand Ðæt wæs hræd ǽrendraca; sé tylode tó secganne hys ǽrndunge ǽr ðon ðé hé lyfde, Shrn; 95, 21. [ we þurh hire erndunge (intercession, mediation) moten iseon hire, Marh. 23, 16: O. E. Homl. i. 207, 31.]
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.