WordReference Random House Learner's Dictionary of American English © 2015
or•di•nal1 /ˈɔrdənəl/USA pronunciation adj. [before a noun] of or relating to order, rank, or position in a series.
n. [countable] an ordinal number or numeral:The word "second'' is an ordinal.See -ord-.

Collins Concise English Dictionary © HarperCollins Publishers::

ordinal /ˈɔːdɪnəl/ adj
  1. denoting a certain position in a sequence of numbers
  2. of, relating to, or characteristic of an order in biological classification
  1. short for ordinal number
  2. a book containing the forms of services for the ordination of ministers
  3. a service book
Etymology: 14th Century: (in the sense: orderly): from Late Latin ordinalis denoting order or place in a series, from Latin ordō order

'ordinal' also found in these entries:

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