[re.gress] n [ME, fr. L regressus, fr. regredi to go back, fr. re- + gradi to go--more at grade] (14c) 1 a: an act or the privilege of going or coming back b: reentry 1
2: movement backward to a previous and esp. worse or more primitive state or condition
3: the act of reasoning backward
[2]re.gress vi (1552) 1 a: to make or undergo regress: retrograde b: to be subject to or exhibit regression
2: to tend to approach or revert to a mean ~ vt: to induce a state of psychological regression in -- re.gres.sor n