As nouns the difference between millionth and microbarn
is that millionth is the person or thing in the millionth position while microbarn is (physics) a unit of surface area equal to one millionth of a barn.
As an adjective millionth
is the ordinal form of the number one million.
millionth
English
Adjective
(-)
The ordinal form of the number one million.
Synonyms
* 1,000,000th, 1,000,000th
Noun
(
en noun)
The person or thing in the millionth position.
One of a million equal parts of a whole. Term ppm (parts per million) is also used.
microbarn
English
Noun
(
en noun)
(physics) A unit of surface area equal to one millionth of a barn