Iustinus

• Jūstīnus

From iūstus (“just, fair, righteous”) +‎ -īnus, from Proto-Italic *jowestos (“just, lawful”), from Proto-Indo-European *h₂yew- (“upright; justice, law”).

• (Classical) IPA^(key): /i̯uːsˈtiː.nus/, [i̯uːs̠ˈt̪iːnʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /jusˈti.nus/, [jusˈt̪iːnus]

Iūstīnus m sg (genitive Iūstīnī); second declension

1. a male given name, feminine equivalent Iūstīna, equivalent to Koine Greek Ἰουστῖνος (Ioustînos) or English Justin
2. Justin:
   • A male given name of historical usage, notably borne by M. Junianus Justinus (Justin), a 2nd century C.E. Latin writer and historian of the Roman Empire
   • A male given name of historical usage, notably borne by Saint Justin Martyr (c. 100–165 C.E.), early Christian apologist, philosopher, saint, and martyr
   • A male given name of historical usage, notably borne by Flavius Justinus (Justin I) (c. 450–527 C.E.), Roman Emperor of the Byzantine Empire, founder of the Justinian dynasty, adoptive uncle of Justinian the Great
   • A male given name of historical usage, notably borne by Justinus Iunior (Justin II) (c. 520–578 C.E.), third Byzantine Roman Emperor of the Justinian imperial dynasty, adopted heir of Justinian the Great

Second-declension noun, singular only.

• Iūstīna
• Iūstīniānus

• Iustinus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette, page 875.
• Iustinus in Georges, Karl Ernst, Georges, Heinrich (1913–1918) Ausführliches lateinisch-deutsches Handwörterbuch, 8th edition, volume 2, Hahnsche Buchhandlung, column 503
• “Justinus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “Iustinus”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers