A more thorough explanation:

quod si contingat (kwod sI kon-ting-at). [Law Latin] Hist. That if it happen. These words were used to create a condition in a deed.

Example 1: "I give you this land, quod si contingat that you marry my daughter."

Example 2: "I bequeath my estate to my son, quod si contingat that he graduates from college."

These examples illustrate how quod si contingat was used in legal documents to create a condition. In the first example, the condition is that the recipient of the land must marry the grantor's daughter. In the second example, the condition is that the recipient must graduate from college in order to inherit the estate.