LATIN DICTIONARYLexicon Latīnum
numeralfirst/second-declension numeral

sēnus1

sēnus (feminine sēna, neuter sēnum)
Classical[ˈseː.nʊs]Ecclesiastical[ˈsɛː.nus]

Meaning

  1. numeralpluralsix each
  2. numeralpoeticpost Classicalsix (collective), sixfold
    ...agedum, dextra, conare aggredi / ingens opus, labore bis seno amplius.Come on, right hand, attempt to undertake the enormous work, greater than the twice sixfold labor(s).c. 4 BCE – 65 CE, Seneca Minor, Hercules furens 1282
    quis labor Aonios seno pede ducere cantus2003 translation by D. R. Shackleton Bailey they whose toil it is to make song in six-foot measure89 CE – 96 CE, Statius, Silvae 5.3.92

Declension

singular
formmasculinefeminineneuter
nominativesēnussēnasēnum
genitivesēnīsēnaesēnī
dativesēnōsēnaesēnō
accusativesēnumsēnamsēnum
ablativesēnōsēnāsēnō
vocativesēnesēnasēnum
plural
formmasculinefeminineneuter
nominativesēnīsēnaesēna
genitivesēnum
sēnōrum
sēnum
sēnārum
sēnum
sēnōrum
dativesēnīssēnīssēnīs
accusativesēnōssēnāssēna
ablativesēnīssēnīssēnīs
vocativesēnīsēnaesēna

Origins

From pre-Latin *seksnos, equivalent to sex + -nus.

proper noun · masculinesecond declension
Senus2
Senus m sg (genitive Senī)
Classical[ˈsɛ.nʊs]Ecclesiastical[ˈsɛː.nus]

Meaning

  1. masculinesingularA river in the land of the Sinae, probably the Saigon River

Declension

declension
formsingularplural
nominativeSenus—
genitiveSenī—
dativeSenō—
accusativeSenum—
ablativeSenō—
vocativeSene—

Origins

From Ancient Greek Σένος (Sénos).

In the Academy Smith's classical dictionaries

proper noun · masculinesecond declension
Sēnus3
Sēnus m sg (genitive Sēnī)
Classical[ˈseː.nʊs]Ecclesiastical[ˈsɛː.nus]

Meaning

  1. A river of Hibernia mentioned by Ptolemy, probably the River Shannon

Declension

declension
formsingularplural
nominativeSēnus—
genitiveSēnī—
dativeSēnō—
accusativeSēnum—
ablativeSēnō—
vocativeSēne—

Origins

From Ancient Greek Σῆνος (Sênos).

In the Academy Smith's classical dictionaries

Quick answers

What does sēnus mean in Latin?
sēnus, a numeral, means “six each; six (collective), sixfold”.
How do you pronounce sēnus?
In classical Latin, [ˈseː.nʊs]; in ecclesiastical (church) Latin, [ˈsɛː.nus].