Etymology

pentadecimal

P3E1N1T1A1D2E1C3I1M3A1L1

Today it means: Based on the number 15; using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D and E. Full definition →

English decimal ← Ancient Greek πεντᾰ- (pentă-) ← Proto-Hellenic *pénkʷe
Ask AI about its historyChatGPTClaudePerplexityGoogle AIGrok

The story

  1. Proto-Indo-European*pénkʷe
  2. Proto-Hellenic*pénkʷe
  3. Ancient Greekπέντε (pénte)
  4. Ancient Greekπεντᾰ- (pentă-)
  5. Englishpenta-
  6. Englishdecimal
  7. English todaypentadecimal

From penta- + decimal.

Etymology from Wiktionary, CC BY-SA 4.0.