Etymology

dekad

D2E1K5A1D2

Today it means: Ten days, especially of rainfall. Generally identified as dekad 1: 1ˢᵗ-10ᵗʰ, dekad 2: 11ᵗʰ-20ᵗʰ, and dekad 3: 21ˢᵗ-last day of each month. Full definition →

Ancient Greek δεκάς
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The story

  1. Ancient Greek · borrowed fromδεκάς“group of ten”
  2. English todaydekad

Borrowed from Ancient Greek δεκάς (dekás, “group of ten”). By surface analysis, deka- + -ad. Doublet of decad and decade.

Words from the same roots

Ancient Greekδεκάς all →

decadedecadeca-

Etymology from Wiktionary, CC BY-SA 4.0.