From Proto-Indo-European *gʰredʰ- (“to walk, go”). Cognate with Old Irish do·gré, Old Welsh grynnyaw (“to press, thrust”). The traditional connection of Proto-Slavic *gręsti (“to go”) (Old Church Slavonic грѧсти (gręsti, “to come, walk, go”)), Lithuanian gri̇̀dyti (“to go, wander”), and Proto-Germanic *gridiz (“step”) (Gothic 𐌲𐍂𐌹𐌸𐍃 (griþs)), Old High German crit) is contested, as the Germanic and Balto-Slavic forms, as well as Old Irish ad·greinn (“to track, follow”), seem to trace back to a different root, Proto-Indo-European *gʰreydʰ-, instead.^[1]

• (Classical Latin) IPA^(key): [ˈɡra.di.ɔr]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈɡraː.di.or]

gradior (present infinitive gradī, perfect active gressus sum); third (-iō variant) conjugation, deponent

1. to step, walk, stride

   Synonyms: vādō, ambulō, deambulō, cammīnō, adeō, obeō, pergō, baetō, eō, cēdō, īnferō

   • 29 BCE – 19 BCE, Vergilius, Aeneis 4.147:

     [...] ipse iugīs Cynthī graditur, [...].

     [Apollo] himself strides upon the ridges of Cynthus, [...].

2. (Medieval Latin, Ecclesiastical Latin, figuratively) to "walk" as in to act or behave, to join with
   • c. 347 CE – 420 CE, Hieronymus, Vulgate Proverbs.13.20:

     Quī cum sapientibus graditur, sapiēns erit: amīcus stultōrum efficiētur similis.

     He that walketh with the wise, shall be wise: a friend of fools shall become like to them. (Douay-Rheims trans., Challoner rev.: 1752 CE)

3. to advance, proceed, go, move

   Synonyms: adorior, prōgredior, prōdeō, prōcēdō, adeō, incēdō, subeō, aggredior, īnferō, succēdō, prōficiō

   Antonyms: discēdō, dīgredior, facessō, excēdō, dēficiō, dēgredior, dēcēdō

• “gradior”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
• “gradior”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
• “gradior”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.