English word centenarian comes from English centenary, English -an
| Dictionary entry | Language | Definition |
|---|---|---|
| centenary | English (eng) | A one-hundredth anniversary. Of, pertaining to, or completing a period of 100 years. |
| -an | English (eng) | Appended to nouns to form an agent noun. (When males with a profession are distinguished from females, males are -an, females -(i)enne.). Of or pertaining to; an adjectival suffix appended to various words, often nouns, to make an adjective form. (Often added to words of Latin origin, but also used with words of other origins. When a word ends in a, -n is used instead.). |
| centenarian | English (eng) | Being at least 100 years old. Beyond one's tenth decade.. Of or relating to a centenarian. One who is at least 100 years old. One who is past his or her tenth decade. |