millionth
/ˈmɪljənθ
/ordinal number
1Constituting number one million in a sequence; 1,000,000th: the museum welcomed its millionth visitor 21 months after opening
1.1 informal Constituting an unspecified but very large number in a sequence: I asked the same question for the millionth time
2Each of one million equal parts into which something is or may be divided: a dot less than a millionth of an inch in diameter
