/ay"teen"/ , n.
1. a cardinal number, ten plus eight.
2. a symbol for this number, as 18 or XVIII.
3. a set of this many persons or things.
adj.
4. amounting to 18 in number.
[ bef. 1000; ME ehtetene, OE eahtatene; c. ON attjan, G achtzehn. See EIGHT, -TEEN ]