nonagenarian

From Latin nōnāgēnārius (“of the number ninety”) (from nonageni (“ninety each”), from nonaginta (“ninety”), from nona- (akin to novem (“nine”)) + -ginta (akin to viginti (“twenty”)), + -arius) +‎ -an

• (Received Pronunciation) IPA^(key): /ˌnɒnæd͡ʒɛˈnɛːɹɪən/

nonagenarian (plural nonagenarians)

1. One who is between the age of 90 and 99, inclusive. One who is in his or her tenth decade.

nonagenarian (not comparable)

1. Being between the age of 90 and 99, inclusive. In one's tenth decade.
2. Of or relating to a nonagenarian.

• vicenarian
• tricenarian
• quadragenarian
• quinquagenarian
• sexagenarian
• septuagenarian
• octogenarian
• centenarian