ge-mǽgþ
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.
ge-mǽgþ
Substitute: A collection of kinsmen, a family Seó dǽd . . . þætte ealre worolde swelce sibbe bringan mehte, te twá þeóda ǽr habban ne mehton, ne ðætte lǽsse wæs, twá gemǽgþa omnibus gentibus unam fuisse voluntatem inservire paci; quod prius ne una quidem civitas, unusve populus civium, vel, quad majus est, una domus fratrum habere potuisset, Ors. 3, 5 ; S. 108, 2. Cf. ge-mǽgas.
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.

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A Combined List of Abbreviations.