/sev"euhn teenth"/ , adj.
1. next after the sixteenth; being the ordinal number for 17.
2. being one of 17 equal parts.
n.
3. a seventeenth part, esp. of one ( 1 / 17 ).
4. the seventeenth member of a series.
[ bef. 900; SEVENTEEN + -TH 2 ; r. ME seventethe, OE seofonteotha. (see SEVEN, TITHE) ]