Etymologically

Etymology and origin of the Latin word secus

secus1 sex

Confidence
Uncertain
First attested
c. 100 BC, Sempronius Asellio

Forms

secus n (indeclinable)[1] It is found only in the nominative and accusative.[2]

Etymology

The noun is related to sexus (“sex”), of which it seems the older formation, although the older texts have only ⟨sexus⟩.[2][3][1] De Vaan considers a link with secō (“to cut”), as “a division”, but finds the formation unclear.[3]

Earliest recorded meaning

Sempronius Asellio, Histories: eum quem virīle secus tum in eō tempore habēbat, of the male sex he then had.[2][4]

Semantic evolution

It is one sex, or its members as a group, mostly in apposition after a noun of number, like id genus: virīle ac muliebre secus, “of the male and female sex”, in Sisenna, Sallust, Livy and Tacitus.[2] Livy counts about ten thousand free persons of the male sex taken at New Carthage.[2]

Timeline

  • c. 100 BC – Sempronius Asellio.[2][4]
  • 120–67 BC – Sisenna of men and women on a wall.[2][4]
  • 59 BC–17 AD – Livy of captives of the male sex.[2][4]
  • 98–115 AD – Tacitus of besieged of both sexes.[2][4]

Meanings

Noun

  1. A sex, gender; its members as a group (virīle secus, males, muliebre secus, females).[2][1]

secus2 otherwise

Confidence
Disputed
Formation
Inherited
First attested
280/260–before 200 BC, Livius Andronicus
Inherited from
Proto-Italic *sekʷos
Ultimate origin
Proto-Indo-European (*se-ḱwo-)

Pronunciation

  • Classical: [ˈsɛ.kʊs][1]
  • Ecclesiastical: [ˈsɛː.kus][1]

Forms

secus (comparative sequius, no superlative)[1]

Etymology

The adverb has two explanations.[3][1] The older one, followed by the OLD, takes it from the root of sequor (“to follow”), as an old participle “following”, so “later, less well”.[3][2][1] In the view of Klingenschmitt, which de Vaan follows, it is inherited from Proto-Italic *sekʷos (“separate”), from Proto-Indo-European *se-ḱwo- (“by itself, separate”), with the prefix sē- (“apart”) and a suffix as in Sanskrit विश्व (víśva, “all”); this fits its cognates Old Irish sech (“past; without”) and Welsh heb (“without”), which a sense “following” does not explain.[3]

Earliest recorded meaning

De Vaan gives Livius Andronicus, Naevius and Plautus as its first authors.[3] In Plautus' Captivi a man says hoc sī secus reperiēs, “if you find this otherwise”.[2]

Semantic evolution

It means “otherwise, differently”, often implying “badly”: Cato tells his hearers to see how differently he acted.[2] Haud secus, “just so”, resumes after a simile, as Virgil's Arruns slinks off like a wolf, and nōn secus ac or quam is “not otherwise than”: Cicero did not speak otherwise than he felt.[2] It also means “amiss, contrary to what was wished” (Cicero: even if things turned out badly), and paulō secus “not far off”.[2] Its comparative is sequius, “less well, differently”.[3][1] In inscriptions it is a preposition, “beside, along” and “in accordance with”, and Charisius reports a sense “after”.[2]

Church Latin glosses it “otherwise, not so, differently, later”, and rarely as a preposition “by, beside, along, near”.[5] Medieval Latin uses the preposition for “along, near, beside” and “in accordance with”.[6]

Timeline

  • 280/260–before 200 BC – Livius Andronicus.[3][4]
  • c. 250–184 BC – Plautus in the sense “otherwise”.[2][4]
  • 234–149 BC – Cato of acting differently.[2][4]
  • 81–43 BC – Cicero of things turning out badly.[2][4]
  • 70–19 BC – Virgil: haud secus.[2][4]

Meanings

Adverb

  1. Otherwise, differently;[2][1][5] nōn secus ac, just as.[2][1][5]
  2. Amiss, badly, contrary to what is wished.[2]
  3. paulō secus, nearly, not far off.[2]

Preposition

  1. (with accusative) Beside, along; in accordance with.[2][1][6]

Word family

  • altrīnsecus
  • circumsecus
  • extrīnsecus
  • forīnsecus
  • intrīnsecus
  • utrimquesecus
  • utrinsecus

References

  1. ^ a b c d e f g h i j k l Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e f g h de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  4. ^ a b c d e f g h i j Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ a b c Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  6. ^ a b Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill

Related etymologies

  • hospes · also from Proto-Italic
  • verbum · also from Proto-Italic
  • reus · also from Proto-Italic
  • ignis · also from Proto-Italic
  • mors · also from Proto-Italic
  • sal · also from Proto-Italic
  • rex · also from Proto-Italic
  • nomen · also from Proto-Italic
Cite this entry

“Secus.” Etymologically, 18 Oct. 2026, etymologically.com/la/secus. Accessed 19 Oct. 2026.

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