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

• (UK) IPA^(key): /ˈməʊ.dʌs ˌɒp.ə.ɹæn.daɪ/
• (New Zealand) IPA^(key): /ˈmɐʉ.dɘs ˌɔp.ɘ.ɹɛn.dɒe/, /ˈmɐʉ.dɘs ˌɔp.ɘ.ɹɛn.di/
• (General American) IPA^(key): /ˈmoʊ.dɘs ˌɑp.əɹ.ɛn.daɪ/, /ˈmoʊ.dɘs ˌɑp.əɹ.ɛn.di/

English Wikipedia has an article on:

modus operandi

Wikipedia

modus operandi (plural modi operandi or modus operandis)

1. (colloquial) A person or thing's normal mode of operation.
   • 2001, Eoin Colfer, Artemis Fowl, pages 92–93:

     Failing that, if contact was absolutely necessary, a series of thumb jabs to the nerve cluster at the base of the neck would be his chosen modus operandi—quiet as a whisper.

2. (law enforcement) A known criminal's established habits and mode of work when committing specific offences, especially fraud, matched with characteristics of an unsolved crime to narrow down (limit to a specific list) or profile suspects.

• MO

• modus procedendi

From English modus operandi, borrowed from Latin modus operandī.

• Hyphenation: mo‧dus‧o‧pe‧ran‧di

modus operandi

1. (law enforcement) a modus operandi
2. a person or thing's normal mode of operation

For quotations using this term, see Citations:modus operandi.

• IPA^(key): /mɔ.dys ɔ.pe.ʁɑ̃(n).di/

modus operandi m (plural modus operandi)

1. (law enforcement) modus operandi

   Synonym: mode opératoire

• “modus operandi”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

Unadapted borrowing from Latin modus operandī (literally “method of working”).

modus operandi m (invariable)

1. modus operandi

Polish Wikipedia has an article on:

modus operandi

Wikipedia ^pl

Unadapted borrowing from Latin modus operandī.

• IPA^(key): /ˈmɔ.dus ɔ.pɛˈran.di/
• Syllabification: mo‧dus o‧pe‧ran‧di

modus operandi m inan (indeclinable)

1. (literary) modus operandi (person or thing's method of operation)

• modus operandi in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
• modus operandi in Polish dictionaries at PWN

Portuguese Wikipedia has an article on:

modus operandi

Wikipedia ^pt

Unadapted borrowing from Latin modus operandī.

modus operandi m (plural modus operandi or modi operandi)

1. modus operandi (method of operation)

Spanish Wikipedia has an article on:

modus operandi

Wikipedia ^es

Borrowed from Latin modus operandī (literally “manner or method of working”).

• IPA^(key): /ˌmodus opeˈɾandi/ [ˌmo.ð̞us o.peˈɾãn̪.d̪i]
• Syllabification: mo‧dus o‧pe‧ran‧di

modus operandi m (plural modus operandi)

1. modus operandi

• “modus operandi”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.7, Royal Spanish Academy [Spanish: Real Academia Española], 2023 November 28

modus operandi n

1. (criminal or more general) modus operandi

• modus operandi in Svenska Akademiens ordlista (SAOL)