Etymologically

Etymology and origin of the Latin word sub-

Confidence
Established
Formation
Inherited
Inherited from
Proto-Italic *supo
Ultimate origin
Proto-Indo-European *upó

Forms

sub-[1] The b is often assimilated before c, f, g, m, p, r (succēdō, sufficiō, suggerō, summoveō, supplicō, surgō); it usually drops before sc and sp (suspiciō), and before t the form is usually sus- (for subs-), also in suscipiō and suscitō.[2][3]

Etymology

It is the preposition sub (“under”) used as a prefix,[2][1] inherited from Proto-Italic *supo (“down, below; upwards”),[3] from Proto-Indo-European *upó (“under, from below”).[3][1] The ⟨s-⟩, which Italic shares with Greek, is not explained.[3]

Cognate with Umbrian sub- as a verbal prefix, Ancient Greek ὑπό (hupó, “under”), Sanskrit उप (úpa, “towards, under”) and Old Irish fo (“under”).[3]

Semantic evolution

Added to verbs it gives the senses of the preposition: position under something, movement down or under, movement up from below, and position or movement close to something; it also marks substitution.[2] Before verbs and adjectives it weakens the meaning (“somewhat, slightly”), and before nouns it marks a lower rank.[2][1] In transferred senses it can mean “secretly” or “in a bad sense, falsely”.[1]

Meanings

Prefix

  1. Under, underneath (substruō, sublinō).[2][1]
  2. Down, downwards, to a place under (sublābor).[2][1]
  3. Up from below, upwards (subdūcō, sublevō).[2][3]
  4. Close to, next, after (subiungō, subsequor).[2]
  5. In place of another, of substitution (sufficiō).[2][1]
  6. Secretly, stealthily; falsely.[1]
  7. With adjectives and verbs: somewhat, slightly (subniger, subdubitō).[2][1]
  8. With nouns: subordinate, of lower rank (succenturiō).[2]

Word family

References

  1. ^ a b c d e f g h i j Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e f de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill

Derived terms

Descendants

Related etymologies

  • oleo · also from Proto-Italic
  • ferveo · also from Proto-Italic
  • aries · also from Proto-Italic
  • arduus · also from Proto-Italic
  • scaevus · also from Proto-Italic
  • libet · also from Proto-Italic
  • cernuus · also from Proto-Italic
  • procus · also from Proto-Italic
Cite this entry

“Sub-.” Etymologically, 23 Oct. 2026, etymologically.com/la/sub-. Accessed 23 Oct. 2026.

Last edited on . ·