Etymology

modus operandi

Today it means: A person or thing's normal mode of operation. Full definition →

Latin modus operandī
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The story

  1. Latin · borrowed frommodus operandī
  2. English todaymodus operandi

Borrowed from Latin modus operandī, from modus (“manner, method”) and operandī (“of working”).

Etymology from Wiktionary, CC BY-SA 4.0.