Adjective **thousandth**, or **thousandth**, comes from the Latin word *millesĭmus*. The first meaning mentioned by the **Royal Spanish Academy** (**RAE**) in his dictionary alludes to **that which, in order, appears after the ninety-ninety-ninth**.

The thousandth edition of something, therefore, is the **number** **1000**. This is the edition after the ninety-ninety-ninth (999).

When the **adjective** applies to a part, refers to **one of the thousand identical parts in which the division of a whole is made**. In this sense the term can also be used as a noun.

Is named **millisecond** to **thousandth of a second**. That is to say: if we divide 1 second into a thousand parts, each of these **fragments** is one thousandth (one millisecond).

The thousandths of a second are **extremely short time slices**. At **colloquial language**, the notion is often used symbolically to refer to what is very fast. For example: *“When they asked me to join this team, I did not hesitate for a thousandth of a second”*, *“The young man finished crossing the track and, a few thousandths later, the train passed at full speed”*, *“For a few milliseconds I didn’t understand what was happening until I realized what was happening …”*.

The use of thousandths of a second is relevant in many **sports**. On the ground of **motoring**, one thousandth can define the winner of a competition. Take the case of qualifying for a grand prize of **Formula 1**: the runner who completes a turn of the circuit in the shortest time, long first. If he **pilot X** made a turn in **1: 35.497** and the **pilot Y** did it in **1: 35.498**, the **pilot X** it took first place by just one thousandth.

The concept of thousandth is also related to numbers **decimals**. In the realm of mathematics, it is known as **decimal number** to that which is represented by means of an integer and a fractional part, separated by a comma or, in other countries, by a period. When we cannot express a quantity using a **whole number**, we resort to decimals; This is very common in the market environment, where prices usually include a part that can be paid in bills (the whole) and another that requires coins (the fractional).

To read and write decimal numbers, we must first consider the integer part, as we can see in the following example: **2.6** It can be read “two point six.” Although in this case the comma is read by its name, the same is not always the case; in the case of prices, it is replaced by the word “with”: *“This television costs 499.95 (four hundred and ninety-nine and ninety-five”*. Another difference that we can notice between numbers in general and prices is that in the latter we can write a fractional part of a single digit but read it as if it were a ten, if we know that it refers to a **amount** in coins that is a multiple of ten: **4.9** It reads “four ninety.”

Now, decimal units are obtained after dividing an integer, that is, the number 1, into equal parts. If the number of parts is ten, it is spoken of tenths; if it is one hundred, hundredths; if it is a thousand, thousandths. If we return to the above examples and wish to write “one thousandth of a second” technically, we must do so using the following **expression**: **0.001 second**.

When we divide a **whole number** In a thousand parts, we get a result with a comma and followed by three digits, one for every zero in the number 1000. In elementary school, teachers often explain to children that 1 moves to the right “one space for every zero” , and in this way it is easy to remember the tenths, the hundredths and the thousandths.

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