on three separate days

USAGE SUMMARY

"on three separate days" is correct and usable in written English.
You can use it when you need to refer to something that occurs or happened on three distinct days. For example, "I interviewed for the job on three separate days before I received an offer."

✓ Grammatically correct

Science

News & Media

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

A total of 200 mg STZ/kg body weight was dosed on three separate days, with day 1 at 100 mg/kg, day 3 at 50 mg/kg and day 4 at 50 mg/kg.

DMM Disease Models and Mechanisms

The clinical haemostasis laboratories received the three sets of blinded samples to be tested using the one-stage clotting assay on three separate days.

Haemophilia

Near simultaneous global images of Venus at 283, 365 nm as well as 0. 9 and 2.02 µm on three separate days (almost one orbit apart) are shown in Fig. 11.

Earth, Planets and Space

In this survey among primary school children in Uganda, the initial prevalence of HBP, assessed by measurement in triplicate on three separate days within one week, was high at 17.1%.

BMC Public Health

Recordings of the number of passages through the staircases from one measurement site were missing on three separate days (0.4% of all measurements) owing to technical failure of the person counter.

BMJ Open

The analysis of the intra-day precision and accuracy was performed in triplicate on the same day; the inter-day precision and accuracy were performed on three separate days.

Clinical Proteomics

Measurements were made at two times of day (dawn and mid-morning) and repeated on three separate days to determine how the reef soundscape might change with time of day.

Nature

Subjects attended on three separate days, 48 h and one month apart.

BMC Palliative Care

To address this deficiency, both pressure and particle motion were recorded at a range of distances from one Hawaiian coral reef at dawn and mid-morning on three separate days.

Nature

Day 5 and day 6 adult worms from hatch offs performed on three separate days were immobilized with tetramisole and imaged on 2% agarose pads.

eLife

The final labelling procedure was subsequently tested through the preparation of three validation batches on three separate days with quality control directly after labelling and for one batch after storage in a plastic syringe for 1.5 h as well.

EJNMMI Research

Expert writing Tips

Best practice

Use "on three separate days" to clearly indicate that an event or action occurred on three different days, not necessarily consecutive. This helps avoid ambiguity, especially in contexts like medical treatments, experimental procedures, or legal proceedings where precise timing matters.

Common error

Avoid using "on three separate days" when you actually mean three consecutive days. If the days are in a row, use "on three consecutive days" instead to prevent misunderstanding.

Linguistic Context

The phrase "on three separate days" functions as an adverbial phrase, modifying a verb by specifying when an action occurred. It provides precise temporal information, indicating that the action took place across three distinct days. Ludwig examples clearly show its usage in describing experimental setups and treatment schedules.

Expression frequency: Very common

Frequent in

Science

75%

News & Media

20%

Academia

5%

Less common in

Ludwig's WRAP-UP

In summary, the phrase "on three separate days" is a grammatically correct and frequently used adverbial phrase, predominantly in scientific and news contexts, to specify the timing of events. As confirmed by Ludwig, its primary function is to provide clarity and precision, indicating actions that occurred across three distinct days. Writers should use this phrase when accuracy in timing is crucial and avoid it when describing consecutive days. Using alternatives like "over a three-day period" or "during three different days" can add variety to writing while maintaining clarity.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

on three distinct days

Focuses on the separateness and clarity of each day.

during three different days

Highlights the difference in the days of occurrence.

across three individual days

Stresses the individuality of each day.

on three unique days

Underscores the originality or special nature of each day.

over a three-day period

Emphasizes the duration across three days rather than distinct occurrences.

on three occasions, each on a different day

Breaks down the phrase to emphasize both the number of occasions and their separation by day.

in the course of three days

Similar to "over a three-day period", emphasizing duration.

spanning three days

Highlights the extent or reach across the three days.

on three non-consecutive days

Explicitly states that the days are not following each other.

throughout three days

Suggests an ongoing action or state continuing across the three days.

FAQs

How can I use "on three separate days" in a sentence?

You can use "on three separate days" to indicate that something happened on three different days. For example, "The medication was administered "on three separate days" to monitor the patient's reaction".

What are some alternatives to saying "on three separate days"?

Alternatives include phrases like "over a three-day period", "during three different days", or "across three individual days", depending on the specific nuance you want to convey.

Is it better to say "on three separate days" or "for three days"?

It depends on the context. "On three separate days" emphasizes that the events occurred on distinct days. "For three days" suggests a duration or period of time. For example, "The study was conducted "on three separate days"", whereas "The symptoms lasted for three days".

What's the difference between "on three separate days" and "on three consecutive days"?

"On three separate days" means the days are distinct and not necessarily following each other. "On three consecutive days" means the events happened on three days in a row.