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millionth (adj.)

"being one of a million equal parts," 1670s, from million + -th (1).

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Definitions of millionth from WordNet
1
millionth (n.)
position 1,000,000 in a countable series of things;
millionth (n.)
one part in a million equal parts;
Synonyms: one-millionth
2
millionth (adj.)
the ordinal number of one million in counting order;
From wordnet.princeton.edu