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millionths

noun
SayMIL-yuhnths/ˈmɪljənθs/

1 meaning of millionths

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  1. 1
    noun
    Plural of millionth.

    Engineers measured the gap between the plates in millionths of a meter.

    Only a few millionths of the original sample remained after the testing.

    Note

    Only the noun has a plural. The ordinal adjective, as in the millionth visitor, never takes an -s. The plural is most at home in the fraction meaning, one of a million equal parts, where a number usually comes first: three millionths of a second. For concentrations, parts per million (ppm) often does the same job.

millionths is a form of millionth

millionth, noun: One of a million equal parts into which a whole is divided. Full entry

Forms
millionthmillionths plural
Spelling
millionth → millionths: add -s
Sound
The ending sounds like /s/.

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