Etymology
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centenarian (n.)

1805, "person 100 years old or older," from centenary + -ian. As an adjective, "pertaining to a person 100 years old," recorded from 1806.

updated on October 26, 2017

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Definitions of centenarian from WordNet
1
centenarian (n.)
someone who is at least 100 years old;
2
centenarian (adj.)
being at least 100 years old;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.