D defs.my
Entry 2 senses Webster, 1913

Progressionist

· Pro·gres·sion·ist · IPA
01 n. One who holds to a belief in the progression of society toward perfection.
  1. 1.
    One who holds to a belief in the progression of society toward perfection.
  2. 2.
    One who maintains the doctrine of progression in organic forms; -- opposed to uniformitarian.