Decrease vs. Shorten vs. Reduce

If you are trying to make something smaller, do you use the word “reduce,” or do you use “shorten” or “decrease”? As the old-timer petroleum engineer would always answer: “That depends.”

Use the word “shorten” if the thing being made smaller is distance or time. Take a look at the units of measure of the thing. If it’s in., cm, ft, m, miles, km or other units of length, or if it’s sec, min, hr, days, weeks, months, or years, then use “shorten.”

OSHA says we will have to shorten the distance from the living quarters to the lifeboats.
Flowback is used to shorten fracture closure times in extremely tight formations.

Use the word “reduce” if you wish to diminish the size, amount, extent or number. Using the word “decrease” implies a progressive decline over a period of time.

If you want to decrease your waistline, you will need to reduce the number of calories in the food you consume.

Here, the caloric reduction happens all of a sudden, but the waistline getting smaller takes time.

Some examples of things that are reduced all of a sudden are: risk, prices, workforces. Some things that are decreased with time are populations in rural areas, drop-out rates in schools, and the number of Americans majoring in science and engineering.


5 Responses to “Decrease vs. Shorten vs. Reduce”

  1. Luis F. Fonseca Says:

    Ms. Perdue,
    I enjoy reading your technical writing tips. Also, I send them to all my family and friends, and everyone learns from them. Please keep educating us in the English language because it might be one day the official language of this great country.
    Thank you
    Luis Fonseca

  2. Dr.sms Says:

    Thanks a lot for sharing this info.

    But it would have been even better if you had mentioned your


  3. 李朔 Says:

    nice explanation! really useful.

  4. Michael Says:

    Thank you Jeanne. It helps!

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