cause

(often with of, typically of adverse results) The source of, or reason for, an event or action; that which produces or effects a result.

"They identified a burst pipe as the cause of the flooding."

(especially with for and a bare noun) Sufficient reason for a state, as of emotion.

"The end of the war was a cause for celebration."

Similar: grounds, justification

A goal, aim or principle, especially one which transcends purely selfish ends.

To set off an event or action.

"The lightning caused thunder."

(ditransitive) To actively produce as a result, by means of force or authority.

"His dogged determination caused the fundraising to be successful."

To assign or show cause; to give a reason; to make excuse.