Standard Lemma guide

pentad

noun · 5 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • General-American: /ˈpɛnˌtæd/
  • Received-Pronunciation: /ˈpɛntad/
  • Southern-England: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

Synonym of quintet: A group of five things, particularly

Synonym of quinquennium: a five-year period, especially in reference to the first and second halves of calendrical decades.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: quinquennium

Antonyms: none provided

2

noun

Meaning 2

Synonym of quintet: A group of five things, particularly

A five-day period, especially a temperature average taken every five days.

Definition source: English Wiktionary via Wiktextract

Topics: climatology, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

Synonym of quintet: A group of five things, particularly

A five-day division of the Chinese calendar, forming part of a solar term (Chinese: 候).

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

Synonym of quintet: A group of five things, particularly

A pentavalent element or group: an atom or molecule with a valence of five, comparable with five atoms of hydrogen.

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, physical-sciences

Examples

  • Nitrogen is a pentad in the ammonium compounds.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

the cardinal number that is the sum of four and one

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: five, 5, V, cinque, quint, quintet, fivesome, quintuplet, fin, Phoebe, Little Phoebe

Antonyms: none provided

Broader terms: digit, figure

History

Etymology

From Ancient Greek πεντάς (pentás), from πέντε (pénte, “five”) + -άς (-ás, “-ad”). By surface analysis, pent- + -ad.

Across languages

Translations

4 source translations are retained for this English entry.

  • Bulgarian: петорка (petorka) — group of five things — see also quintet
  • Finnish: viisikko — group of five things — see also quintet
  • Finnish: viisivuotiskausi — five-year period
  • Finnish: hou — five-day division of the Chinese calendar
Real reading context

pentad in complete knowledge articles