Millionth
WordNet
adjective
(1) The ordinal number of one million in counting order
noun
(2) One part in a million equal parts
(3) Position 1,000,000 in a countable series of things
WiktionaryText
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.