American Heritage Dictionary
(3)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
But now she was a septuagenarian, she'd stopped driving.— Carmen Agra Deedy spins stories
Here's this septuagenarian, driving 20-year-olds crazy in their seats as he travels from song to song that they love as much as their grandparents did.— Long Island Press
When last we visited with Corky Simpson, the septuagenarian was taking a beating for inexplicably leaving Rickey Henderson off of his Hall of Fame ballot.— River Avenue Blues
One septuagenarian, Bryn Mawr '29, knew where all the bodies in the county were buried but she could never get it out of her typewriter.— The American Spectator

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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