coming last in a series of a million.
being one of a million equal parts.
the millionth member of a series.
a millionth part, especially of one (1/1,000,000).

1665–75; million + -th2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
millionth (ˈmɪljənθ)
1.  a.  one of 1 000 000 approximately equal parts of something
 b.  (as modifier): a millionth part
2.  one of 1 000 000 equal divisions of a particular scientific quantityRelated: micro-
3.  the fraction equal to one divided by 1 000 000
4.  (usually prenominal)
 a.  being the ordinal number of 1 000 000 in numbering or counting order, etc
 b.  (as noun): the millionth to be manufactured
Related: micro-

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The chromosphere is only one-millionth as dense as the photosphere.
The difference would be only about one-millionth of a second.
Cool a gas of rubidium atoms to one-hundred-millionth of a degree above absolute zero or less and something strange happens.
So good a vacuum is produced that it is estimated that at the utmost no more than a one-millionth part of the air remains.
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