1. gressio — de Vaan
gressio 'stepping' (Pac), gressus, -lis 'step, walk' (Acc.+); aggredi, -gressus 'to advance, approach' (PL+), congredi 'to meet, join battle' (PL+), congressus, -us 'meeting, encounter' (Lucr.+), degredi 4to depart, go down' (PL+), digredi 4to go away' (Ter.+), ingredi 'to enter, begin' (P1.+), indugredi 'to enter' (Lucr.), prdgredi 'to advance, proceed' (P1.+), regredi'to go back' (P1.+); aggretus 'departure', … — [de Vaan, s.v. gressio, p. 283]