The Collaborative International Dictionary of English v.0.48:

Progress \Pro*gress"\ (?; formerly pronounced like Progress,
   n.), v. i. [imp. & p. p. Progressed; p. pr. & vb. n.
   Progressing.]
   [1913 Webster]
   1. To make progress; to move forward in space; to continue
      onward in course; to proceed; to advance; to go on; as,
      railroads are progressing. "As his recovery progressed."
      --Thackeray.
      [1913 Webster]

            Let me wipe off this honorable dew,
            That silverly doth progress on thy checks. --Shak.
      [1913 Webster]

            They progress in that style in proportion as their
            pieces are treated with contempt.     --Washington.
      [1913 Webster]

            The war had progressed for some time. --Marshall.
      [1913 Webster]

   2. To make improvement; to advance. --Bayard.
      [1913 Webster]

            If man progresses, art must progress too. --Caird.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "progressing":
   advancing, ambulant, ambulative, ambulatory, ameliorative,
   bettering, bradytelic, circuit-riding, developing, evolutional,
   evolutionist, evolutionistic, evolving, expeditionary, forward,
   forward-looking, genetic, globe-girdling, globe-trotting, go-ahead,
   going, horotelic, improving, itinerant, itinerary, journeying,
   locomotive, looking up, maturational, maturative, maturing,
   meliorative, mending, moving, mundivagant, on the lift,
   on the mend, on tour, oncoming, ongoing, ontogenetic, onward,
   passing, pedestrian, perambulating, perambulatory, peregrinative,
   peregrine, peripatetic, phylogenetic, physiogenetic, pilgrimlike,
   proceeding, progressive, strolling, tachytelic, touring, touristic,
   touristy, traveling, trekking, unfolding, walking, wayfaring