Definitions for "Millionth"
Being the last one of a million of units or objects counted in regular order from the first of a series or succession; being one of a million.
position 1,000,000 in a countable series of things
the ordinal number of one million in counting order
Keywords:  quotient, divided, equal, unit, parts
The quotient of a unit divided by one million; one of a million equal parts.
Keywords:  part, one
one part in a million