Survey and valuation of property, made by its lord or by the royal government. (Frame, Robin. Colonial Ireland, 1169-1369, 144) Document enumerating lands, services, and rents of a manor. (Gies, Frances and Joseph. Life in a Medieval Village, 244) The formal recitation and valuation of the various lands of a manor, and also of the services, rents, profits, etc. of the same. (Bennett, H.S. Life on the English Manor: A Study of Peasant Conditions, 1150-1400, 337)

A manorial survey that has a valuation attached to every property (usually dating from 13-14 century).

a description of the estimate of the area and value of a manor, including a list of the tenants, with their holdings, rents and services compiled on the testimony of a sworn jury of the inhabitants of the manor

manorial document listing holdings and tenants with their obligations in labour services and rent, also known as a terrier

a census or valuation of all the lands in Scotland for tax purposes. The "auld (old) extent" was probably made in the 13th century. By 1474, it had been noticed that it was a bit out of date, and it was replaced by the "new extent" (which was often just the auld extent multiplied by 4,5 or 6). Lands continued to be described in terms of these extents long after either were made as e.g "the ten-shilling lands of ..... of auld extent"