Pronunciation: (twelfth), [key]
1. next after the eleventh; being the ordinal number for 12.
2. being one of 12 equal parts.
1. a twelfth part, esp. of one (1/12).
2. the twelfth member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.