pentad

[pen-tad]

pen·tad

[pen-tad]
noun
1.
a period of five years.
2.
a group of five.
3.
the number five.
4.
Chemistry. a pentavalent element or group.
5.
Climatology. a period of five consecutive days.

Origin:
1645–55; < Greek pentad- (stem of pentás) group of five. See pent(a)-, -ad1
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Pentad is always a great word to know.
So is titanic. Does it mean:
an atomic spatial arrangement that results from rotation of carbon atoms about single bonds within an organic molecule
of or containing titanium, especially in the tetravalent state or three valence state
Collins
World English Dictionary
pentad (ˈpɛntæd)
 
n
1.  a group or series of five
2.  the number or sum of five
3.  a period of five years
4.  chem a pentavalent element, atom, or radical
5.  meteorol a period of five days
 
[C17: from Greek pentas group of five]

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