adjective.
Being between the age of 70 and 79, inclusive. In one's eighth decade.
adjective.
Of or relating to a septuagenarian.
noun.
One who is between the age of 70 and 79, inclusive.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
someone whose age is in the seventies
Word Usage
"Wine he calls a septuagenarian, the letters of the Hebrew word for wine (_yayin_) representing seventy, and water a nonagenarian, because _mayim_ (water) represents ninety:"