Millonésima

Millonésima is a Spanish word that translates to "millionth" in English. It refers to the ordinal number representing the position of one million in a sequence. For example, the millonésima person in line is the one millionth person. It is derived from the word "millón," which means "million."

In mathematical contexts, millonésima can be used to describe fractions or proportions. A millonésima part of something would be one divided by one million. This is often expressed as a very small quantity or a very precise measurement. For instance, if a material's purity is measured to the millonésima, it indicates an extremely high level of refinement.

The concept of a millionth is significant in fields requiring high precision, such as metrology (the science of measurement) or particle physics, where phenomena can occur at extremely small scales. The term emphasizes the extreme smallness or the culmination of a vast number. It is the counterpart to "millonésimo," the masculine form, which is used when referring to a masculine noun or in a general sense.