actus reus

UK/ˌaktəsˈɹeɪəs/UK/ˌaktəsˈɹiːəs/

noun

The act or acts constituting a criminal offense, as distinguished from the intentions or state of mind of the perpetrator (mens rea).

Similar
wrongdoingwrongful conductmisconduct
First used 20th c.

Meanings

nounactus reus (plural actus rei)

plural actus rei

  1. lawThe act or acts constituting a criminal offense, as distinguished from the intentions or state of mind of the perpetrator (mens rea).First known use 20th c.

    It is hornbook criminal law that criminal offenses are defined in terms of an actus reus (criminal act) and a mens rea (criminal mind).

    1989, James B. Jacobs, Drunk Driving: An American Dilemma, University of Chicago Press, page 65
    2 more examples

    A brute emotional reflex to the actus reus, the bad act (‘She killed her husband! Shame!’), could trigger an urge for retribution regardless of her intention.

    2011, Steven Pinker, The Better Angels of Our Nature, Penguin 2012, page 610

    Every criminal offence must contain actus reus elements. A defendant will not be liable for a criminal offence unless the actus reus of the offence is proved: Deller (1952)36 Cr app r 184. Although the vast majority of criminal offences consist of both actus reus elements and mens rea elements, some criminal offences do not require a mens rea element for every element of the actus reus.

    2016, Nicola Monaghan, Criminal Law, 4th edition, Oxford University Press, page 23

Synonyms & antonyms

nounactivity that transgresses moral or civil law

Similar
wrongdoingwrongful conductmisconduct
Broader

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Latināctus“act”
  2. Late Latināctus reus“guilty act”
  3. Englishactus reus

From Late Latin āctus reus (“guilty act”), from Latin āctus (“act”) + reus (“guilty”); after Late Latin and English mens rea.

Full word history & related roots →

Translations

Chinese Mandarin 法律構成要件 /法律构成要件, 構成要件 /构成要件
  • 法律構成要件 /法律构成要件 (fǎlǜ gòuchéng yàojiàn)criminal act
  • 構成要件 /构成要件 (gòuchéng yàojiàn)criminal act
  • 犯罪行為 /犯罪行为 (fànzuì xíngwéi)criminal act
Finnish rikollinen teko
  • rikollinen tekocriminal act
German strafbare Handlung, objektiver Tatbestand
  • strafbare Handlungcriminal act
  • objektiver Tatbestandcriminal act
Indonesian actus reus
  • actus reuscriminal act
Japanese 構成要件
  • 構成要件 (kousei youken)criminal act
Malay actus reus
  • actus reuscriminal act
Russian противопра́вное де́йствие, правонаруше́ние
  • противопра́вное де́йствие (protivoprávnoje déjstvije)criminal act
  • правонаруше́ние (pravonarušénije)criminal act
Cite this entry
APA

actus reus. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/actus%20reus

MLA

“actus reus.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/actus%20reus. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “actus reus,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/actus%20reus.

Source: actus reus on Wiktionary, CC BY-SA 4.0.