eightieth

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈeɪtiəθ/US:USA pronunciation: respellingUSA pronunciation: respellingtē ith)


WordReference Random House Unabridged Dictionary of American English © 2020
eight•i•eth  tē ith),USA pronunciation adj. 
  1. next after the seventy-ninth;
    being the ordinal number for 80.
  2. being one of 80 equal parts.

n. 
  1. an eightieth part, esp. of one (&fracnumer;
    1&fracdenom;
    80&fracend;
    ).
  2. the eightieth member of a series.
  • Middle English eightetithe, Old English (hund)eahtatigotha eightieth. See eighty, -th2 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::
ˈeightieth /ˈeɪtɪɪθ/ adj
  1. (usually prenominal) being the ordinal number of eighty in numbering or counting order, position, time, etc: often written 80th
  2. (as noun): the eightieth in succession
n
  1. one of 80 approximately equal parts of something
  2. (as modifier): an eightieth part
  3. the fraction equal to one divided by 80 ( 180)
WordReference Random House Learner's Dictionary of American English © 2020
eight•y /ˈeɪti/USA pronunciation   n.[countable]pl.  eight•ies. 
  1. a number, ten times eight.
  2. a symbol for this number, as 80 or LXXX.
  3. eighties, [plural] the numbers from 80 through 89, as in referring to the years of a lifetime or of a century or to degrees of temperature: [one's + ~]He's in his eighties (= He is between 80 and 89 years of age).[the + ~]The temperature is in the eighties.
eight•i•eth, adj. 

WordReference Random House Unabridged Dictionary of American English © 2020
eight•y  tē),USA pronunciation n., pl.  eight•ies, adj. 
n. 
  1. a cardinal number, ten times eight.
  2. a symbol for this number, as 80 or LXXX.
  3. a set of this many persons or things.
  4. eighties, the numbers, years, degrees, or the like, from 80 through 89, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature.

adj. 
  1. amounting to 80 in number.
  • Middle English eighteti, Old English eahtatig. See eight, -ty1 bef. 850

'eightieth' also found in these entries (note: many are not synonyms or translations):
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