Modus operandi

Definition and stakes

Frank H. Vizetelly,  A Desk-Book of Errors in English

“ An act is accomplished by an exercise of power, whereas an action is the fact of exerting such power and refers to the modus operandi. A party to a conveyance signifies his exercise of power by the formula “This is my act and deed,” but the course pursued, the procedure—the fact of sale and purchase—may be referred to as a wise action. ”
Source: Gutenberg

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