LATIN DICTIONARYLexicon Latīnum
verbfirst/second-declension participle

aptus

aptus (feminine apta, neuter aptum, comparative aptior, superlative aptissimus, adverb aptē)
Classical[ˈap.tʊs]Ecclesiastical[ˈap.tus]
№ 916 of the 1,000 commonest wordsMille Verba core vocabulary

Meaning

  1. participlesuitable, adapted
  2. participleready
  3. participleapt, proper
  4. participlebound, tied, attached, joined (to)
    Apex, quod est sacerdotum īnsigne, dictus est ab eō, quod comprehendere antīquī vinculō apere dīcēbant. Unde aptus est, quī conventienter alicui iūnctus est.The apex, which is the ensign of the Flamen, is called so because of the fact that in, the old language, tying with a rope was called apere. Whence aptus is something which is conventiently joined to something.1839 [8th century CE], Paulus Diaconus, edited by Karl Otfried Müller, Excerpta ex libris Pompeii Festi De significatione verborum, page 17, line 9:
  5. participledependent (on)

Latīnē defined in Latin in our graded readers

quī bene convenit; hoc lignum aptum est ad nāvem.
aptus -a -um — in Mille Verba, Nāvāle

Choosing the right word Döderlein's Latin Synonyms

Idoneus · Aptus

Idoneus denotes a passive, aptus an active fitness for any thing. F. A. Wolf. Or, the idoneus is fitted by his qualifications, and, through outward circumstances, for any particular destination, like the ἐπιτήδειος; the aptus (from potis, potens), by his worth and adequacy, like ἱκανός. The idoneus is in himself inactive, and suffers himself to be employed for a particular purpose, for which he is qualified; the aptus himself engages in the business, because he is adequate to it. (iii. 276.)

Phrases from Meissner's Latin Phrase-Book

apte (aptissime) cohaerere
to be very intimately related.
conexum et aptum esse inter se
to be closely connected with each other.
continuatio seriesque rerum, ut alia ex alia nexa et omnes inter se aptae colligataeque sint (N. D. 1. 4. 9)
systematic succession, concatenation.

aptus, a, um, v. apo, P. a.

Origins

  1. Proto-Indo-European*h₂ep-
  2. Proto-Indo-European*h₂ptós
  3. Proto-Italic*aptos
  4. Latinaptus

From Proto-Italic *aptos, which has been connected to the root Proto-Indo-European *h₂ep- (“to join, fit (in)”) or to the perfect passive participle of apiō (“fasten, join”).

Descendants
  • Catalanapte
  • Englishapt
  • Frenchapte
  • Italianatto
  • Portugueseapto
  • Romanianapt
  • Spanishapto
  • Albanianaftë
  • Galicianapto

Quick answers

What does aptus mean in Latin?
aptus, a verb, means “suitable, adapted; ready; apt, proper”.
What are the principal parts of aptus?
aptus, apta, aptum (first/second-declension participle).
How do you pronounce aptus?
In classical Latin, [ˈap.tʊs]; in ecclesiastical (church) Latin, [ˈap.tus].
Where does aptus come from?
Proto-Indo-European *h₂ep- → Proto-Indo-European *h₂ptós → Proto-Italic *aptos → Latin aptus.