One who is between the age of 90 and 99, inclusive. One who is in his or her tenth decade.
Being between the age of 90 and 99, inclusive. In one's tenth decade.
Other Word Forms of Nonagenarian
Origin of Nonagenarian
From Latin nōnāgÄ“nārius (“of the number ninety") (from nonageni (“ninety each"), from nonaginta (“ninety"), from nona- (akin to novem (“nine")) + -ginta (akin to viginti (“twenty")), + -arius) +"Ž -an
From Latin nōnāgēnārius from nōnāgēnī ninety each from nōnāgintā ninety nōnus ninth nona– -gintā ten times dekm̥ in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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