WordReference Random House Learner's Dictionary of American English © 2017
or•di•nal1 /ˈɔrdənəl/USA pronunciation   adj. [before a noun]
  1. of or relating to order, rank, or position in a series.

n. [countable]
  1. an ordinal number or numeral:The word "second'' is an ordinal.
See -ord-.
WordReference Random House Unabridged Dictionary of American English © 2017
or•di•nal1  (ôrdn əl),USA pronunciation adj. 
  1. of or pertaining to an order, as of animals or plants.
  2. of or pertaining to order, rank, or position in a series.

  1. an ordinal number or numeral.
or di•nal•ly, adv. 
  • Late Latin ōrdinālis in order equivalent. to Latin ōrdin- (stem of ōrdō ) order + -ālis -al1
  • 1590–1600

or•di•nal2  (ôrdn əl),USA pronunciation n. 
  1. Religiona directory of ecclesiastical services.
  2. Religiona book containing the forms for the ordination of priests, consecration of bishops, etc.
  • Medieval Latin ōrdināle, noun, nominal use of neuter of ōrdinālis in order. See ordinal1
  • Middle English 1350–1400

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

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