millionth

USMIL-yuhnth/ˈmɪljənθ/

3 meanings of millionth

1
adjective
Occupying the position numbered one million in a sequence or counting order.
The city welcomed its millionth visitor of the year on Tuesday morning.
Engineers paused the line to inspect the millionth unit for defects.
2
nouncountable
One of a million equal parts into which a whole is divided.
Like one second measured against the roughly eleven and a half days that a million seconds add up to.
The sensor can detect a millionth of a gram of the toxin.
Pollutants were present at only a few millionths of the water's volume.
3
nouncountable
Whoever or whatever occupies the position numbered one million in a series.
The millionth through the gates received free tickets for life.
Being the millionth to download the app earned her a special badge.

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Formed from "million" combined with the ordinal suffix "-th".