Etymology

congressional

C3O1N1G2R1E1S1S1I1O1N1A1L1

Today it means: Of or relating to a congress. Full definition →

Proto-Indo-European *h₂élisder.? ← English congression
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The story

  1. Englishcongression
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todaycongressional

From congression + -al.

Etymology from Wiktionary, CC BY-SA 4.0.