quinquagenarian

quin·qua·ge·nar·i·an

[kwing-kwuh-juh-nair-ee-uhn, kwin-]
adjective
1.
50 years of age.
2.
between the ages of 50 and 60.
noun
3.
a person who is 50 years old or whose age is between 50 and 60.

Origin:
1560–70; < Latin quīnquāgēnāri(us) (see quinquagenary) + -an

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
quinquagenarian (ˌkwɪŋkwədʒɪˈnɛərɪən) [Click for IPA pronunciation guide]
 
n
1.  a person between 50 and 59 years old
 
adj
2.  being between 50 and 59 years old
3.  of or relating to a quinquagenarian
 
[C16: from Latin quinquāgēnārius containing fifty, from quinquāgēnī fifty each]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Quinquagenarian has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
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