A more thorough explanation:

Locarium (lə-kair-ee-əm), n. [Law Latin] Hist. Rent.

Definition:Locarium refers to a type of rent in historical legal Latin.

Example: In medieval times, a tenant might pay their landlord with a portion of their crops or livestock as locarium instead of with money.

Explanation: This example illustrates how locarium was a form of rent that was paid in goods or services instead of money. It was a common practice in medieval times when money was scarce and people relied more on bartering and trading goods.