I. -ēn(t)th adjective
Etymology: Middle English sevententhe, alteration (influenced by seventene ) of seventethe, from Old English seofontēotha (akin to Old Norse sjautjāndi, sjautāndi seventeenth), from seofontīene, seofontȳne, seofontēne seventeen + -otha, -tha -th
1. : being number 17 in a countable series
the seventeenth day
— see number table
2. : being one of 17 equal parts into which something is divisible
a seventeenth share of the money
II. noun
( plural seventeenths )
1. : number 17 in a countable series
the seventeenth of the month
2. : the quotient of a unit divided by 17 : one of 17 equal parts of something
one seventeenth of the total
3.
a. : an interval of two octaves and a third
b. : a pipe-organ stop sounding two octaves and a major third above the normal