A modus operandi is an individual's habits of working, particularly in the context of business or criminal investigations, but also generally. It is a Latin phrase, approximately translated as 'mode of operating'.
A guide to Modus operandi
Why Modus operandi is relevant in U.S. law
Modus operandi appears in U.S. legal practice across multiple practice areas. Knowing what it means — and when it applies — can determine the outcome of motions, filings, and negotiations. For non-lawyers, the value of looking up a precise definition is that legal terms often carry meanings that differ from everyday usage; relying on the common meaning can lead to costly missteps.
When and how Modus operandi applies
In practice, Modus operandi is invoked when parties, judges, or attorneys need to identify the legal status of an issue, the rights of those involved, or the procedural step required next. The definition shown above is sourced from Wikipedia , which is widely cited in U.S. legal practice. Because U.S. law is jurisdictionally layered — federal, state, and sometimes local — the precise application of the term can vary by court, so check the controlling authority for your specific case.