ret·ro·gress I. \ˈre.trəˌgres sometimes ˈrē.t-\noun (-es) Etymology: Late Latin retrogressus, from Latin, past participle of retrogradi to retrogress : retrogression II. \| ̷ ̷ ̷ ̷| ̷ ̷\verb (-ed/-ing/-es) Etymology: Latin retrogressus, past participle of retrogradi to retrogress intransitive verb : to move backward : revert to an earlier state or condition transitive verb : regress