AYLESBOURY, or ALESBOURY, a borough town in Buckinghamshire, consisting of about 400 houses. It consists of several streets, though the houses are not very contiguous; these lie round about the market-place, in the middle of which is a convenient hall, where the sessions are held, and sometimes the assizes for the county. It sends two members to Parliament; has a market on Saturdays; and three fairs for cattle, viz. on the Saturday before Palm-sunday, June 14th, and September 25th. It is sixty miles south-east of Buckingham, and forty-four north-west of London. W. Long, o. 40. N. Lat. 51° 40'.