A name applied to the lands in a village which are cultivated by the hereditary proprietors or village Zamindars themselves as their own especially share, either by their own labourers and at their own cost, or by tenants-at-will, not being let in lease or farm. [P Ramanatha Aiyer’s The Law Lexicon]

Sir land means private land of proprietor. AIR 1956 SC 305; 1956 SCJ 279; 1956 SCR 1.