Adjective millionth has 1 sense
  1. millionth - the ordinal number of one million in counting order
    Antonym:
    cardinal (indirect, via ordinal)
,Noun millionth has 2 senses
  1. millionth - position 1,000,000 in a countable series of things
    --1 is a kind of
    rank
  2. one-millionth, millionth - one part in a million
    --2 is a kind of common fraction, simple fraction
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