millionth

nouns

position 1,000,000 in a countable series of things
is a type of (narrower)
relative status
"his salary was determined by his rank and seniority"
one part in a million equal parts

adjectives

the ordinal number of one million in counting order
is similar to
being or denoting a numerical order in a series
"ordinal numbers"; "held an ordinal rank of seventh"