The word "one-hundred-thousandth" refers to a fraction that represents the quotient of dividing one by one hundred thousand. However, there are various different terms that can be used in place of this phrase, including "one part in a hundred thousand", "a ten-micron", "a ten-thousandth of a percent" or "a ten-thousandth". Each of these phrases conveys the same idea as "one-hundred-thousandth" but can be more precise, depending on the context in which it is being used. These synonyms are often used in scientific fields such as chemistry, physics, and engineering where precision and accuracy are highly valued.