ceósan
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.
ceósan
AddCeóseþ legit, Wrt. Voc. ii. 53, 34. 1. to choose a person as lord Ic eom fyrmdig tó þám híwum hý hine ceósan, Cht. Th. 487, 28. Ic wylle þæt man ágyfe þám híwum hyra freóls swylce hand tó ceósenne swylce him leófast sý, 492, 17. 2. ceósan tó to choose as, elect to an office Man ceás Arnwi munec tó aƀƀ., Chr. 1041; P. 163, 16. Ðá cusen þá munecas tó abbot Brand, 1066; P. 199, 1.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

Abbreviation not recognized. See:

A Combined List of Abbreviations.