pentadecimal

P3E1N1T1A1D2E1C3I1M3A1L1

adjective

Based on the number 15; using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D and E.

Similar
base 15quindecimal
OriginEnglish decimal ← Ancient Greek πεντᾰ- (pentă-) ← Proto-Hellenic *pénkʷe →
Scrabble 19
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Meanings

adjectivepentadecimal (not comparable)
  1. not comparablecomputingBased on the number 15; using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D and E.

    Kleene [13] uses a similar approach, based on Turing machine encodings over an alphabet of fifteen symbols, which are then translated into pentadecimal numbers.

    1980 April, Norman H Cohen, “Gödel numbers: a new approach to structured programming”, in ACM SIGPLAN Notices

    Synonyms: base 15, quindecimal

Synonyms & antonyms

adjectiveBased on the number 15; using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D and E.

Similar
base 15quindecimal

Origin

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

From penta- + decimal.

Full word history & related roots →
Cite this entry
APA

pentadecimal. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/pentadecimal

MLA

“pentadecimal.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pentadecimal. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “pentadecimal,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/pentadecimal.

Source: pentadecimal on Wiktionary, CC BY-SA 4.0.