Socage

n. right to possess land in return for agricultural or other nonmilitary services (according to medieval English law)

Socage was one of the feudal duties and hence land tenure forms in the feudal system. A farmer, for example, held the land in exchange for a clearly-defined, fixed payment to be made at specified intervals to his feudal lord, who in turn had his own feudal obligations to the Crown. In theory this might involve supplying the lord with produce but most usually it meant a straightforward payment of cash, i.e., rent.
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Noun
1. land tenure by agricultural service or payment of rent; not burdened with military service
(hypernym) service

(n.)
A tenure of lands and tenements by a certain or determinate service; a tenure distinct from chivalry or knight's service, in which the obligations were uncertain. The service must be certain, in order to be denominated socage, as to hold by fealty and twenty shillings rent.
  

A term of the feudal system which referred to the tenure which was exchanged for certain goods or services which were not military in nature. - (read more on Socage)