A more thorough explanation:

Definition: Intrinsec service refers to the feudal services that a tenant owes to their immediate lord. These services arise from an agreement between the tenant and the lord.

Example: In medieval times, a tenant might owe their lord intrinsec service in the form of providing labor on the lord's land or military service in times of war.

This example illustrates how intrinsec service was a key aspect of the feudal system, where tenants were bound to their lords by a system of obligations and services.