Fromre- +‎gradior(“step, walk”).

• (Classical Latin)IPA^(key):[rɛˈɡrɛ.di.ɔr]
• (modern Italianate Ecclesiastical)IPA^(key):[reˈɡrɛː.d̪i.or]

regredior (present infinitiveregredī,perfect activeregressussum);third conjugationiō-variant,deponent

1. togo orcome back;turn back,return

   Synonyms:redeō,revertor,reveniō,recipiō

2. (military) tomarch back,withdraw,retire,retreat

   Synonyms:dēcēdō,discēdō,cēdō,deficiō,concēdō,excēdō,subtrahō,subdūcō,abscēdō,inclīnō,recēdō,facessō,āmoveō,recipiō,referō,vertō

   Antonyms:prōgredior,prōdeō,prōcēdō,prōficiō,aggredior,ēvehō,incēdō,accēdō,adeō

3. (law) to haverecourse,revert

• regressiō
• regressus

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