pentad

pen·tad  (pntd)

n.

A group of five.

---

[Greek pentas, pentad-, group of five, from pente, five; see penk^we in Indo-European roots.]

---

pentad [ˈpɛntæd]

n

1. (Mathematics) a group or series of five

2. (Mathematics) the number or sum of five

3. a period of five years

4. (Chemistry) Chem a pentavalent element, atom, or radical

5. (Earth Sciences / Physical Geography) Meteorol a period of five days

[from Greek pentas group of five]

---

Pentad a group of five, especially five years, 1880.

Thesaurus

Noun

1.

pentad - the cardinal number that is the sum of four and one 5, cinque, fin, five, fivesome, Little Phoebe, Phoebe, quint, quintuplet, quintet, V digit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"