|a.||1.||Oldest; longest in duration.|
|2.||Born or living first, or before the others, as a son, daughter, brother, etc.; first in origin. See Elder.|
|Noun||1.||eldest - the offspring who came first in the order of birth|
|Adj.||1.||eldest - first in order of birth; "the firstborn child"|
ELDEST. He or she who has the greatest age.
2. The laws of primogeniture are not in force in the United States; the eldest child of a family cannot, therefore, claim any right in consequence of being the eldest.