(historical) In Anglo-Saxon law, the owner of an allotment or yard-land, usually consisting of 30 acres; a villein.
From Old English ġebūr (“dweller, husbandman, farmer, countryman, boor”), from Proto-Germanic*ga-, *būraz (“house, room,dwelling”), from Proto-Indo-European*bʰū- (“to swell, wax, grow”), equivalent to ge- + bower. More at bower, boor.
English Wiktionary. Available under CC-BY-SA license.
The gafolgelda or tributarius (tribute-payer) seems to have been a ceorl who possessed at least a hide, while the gebur was without land of his own, and received his outfit as a loan from his lord.
On the other hand the gebur seems not to have been liable to payments of this kind, presumably because the land which he cultivated formed part of the demesne (inland) of his lord.
The Latin version of the Rectitudines Singularum Personarum, a document compiled probably in the i rth century, not long before the Conquest, renders geneat (a peasant tenant of a superior kind performing lighter services than the gebur, as he was burdened with heavy week-work) by villanus; but the gebur came to be also considered as a villanus according to AngloNorman terminology.