adj
millionth
MIHL-yuhnth
adj
1
Coming after the 999,999th in a sequence; the ordinal form of "million".
"The theme park welcomed its millionth visitor this week."
noun
1
One of a million equal parts of something.
"The gauge measures gas concentration in millionths, or parts per million."
How to Use Millionth
Learner’s notesIn plain EnglishThe number that comes after 999,999th, or one part out of a million equal parts.
Common pairings
the millionth customer
parts per million
Word Forms
millionths plural
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The theme park welcomed its _____ visitor this week.
Etymology
Formed from million plus the ordinal ending "-th".