Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
period
Grammar usage guide and real-world examplesUSAGE SUMMARY
The word "period" is correct and usable in written English.
You can use it as a noun when referring to the cycle of menstruation, or in the sense of a punctuation mark at the end of a sentence; in this case it is often followed by a full stop. For example: I have to look after my dog every month; her shedding period usually lasts a few days.
✓ Grammatically correct
News & Media
Formal & Business
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
"We're working hard over the holiday period to make the necessary adjustments to our timetable as a consequence, and to provide as much information as we can".
News & Media
According to the Campaign for Better Transport (CBT), the cost of a Milton Keynes season ticket has risen 23.5%, or £930, since January 2010 and is one of a number of fares that have increased around four times more than average wages over this five-year period.
News & Media
The course will have places for 12 participants who will meet for one three-hour session per week (6.30pm - 9.30pm) for a period of six months at the Guardian Building, 90 York Way, Kings Cross, London N1 9GU.
News & Media
"This was during a period of high intensity, with an unprecedented number of arrivals and an increased number of people presenting with a range of significant, complex medical conditions".
News & Media
The political rhetoric over immigration will further intensify on Monday as David Cameron promises to ban all EU nationals from claiming most benefits after six months in the UK unless they can prove they have been continuously looking for work over that period.
News & Media
"GMG is entering a new period of growth, thanks to the strategic leadership of Andrew Miller and Alan Rusbridger.
News & Media
"It didn't get the strongest winds in the eye wall but it certainly got a period of nearly three hours of sustained gale force winds and wind gusts in the 95 to 100km/h range".
News & Media
The course will have places for 12 participants who will meet for one three-hour session per week (6.30pm-9.30pm) for a period of six months at the Guardian building at Kings Place, London N1 9GU.
News & Media
His record - two cups within six months of his appointment, a domestic treble in his first full season, a second title in 2005 and reaching the last 16 of the Champions League - set the context for a rueful but masterfully understated parting comment: "I'm sure those people who look at the facts will say that during a period of downsizing, I was reasonably successful".
News & Media
He pointed out that having founded the FN and "led it during a period of 40 years of constant adversity" he considered himself a good "locomotive" to head the local regional election campaign.
News & Media
A total of £1.3m was spent on flights in 2013-14 and 2104-15 but £32m was spent on rail travel during that period.
News & Media
Expert writing Tips
Best practice
Be precise about the type of "period" you are referring to. Is it a time frame, a historical era, or a punctuation mark? Clarity enhances understanding.
Common error
Avoid ambiguity by specifying which historical "period" you are referencing. Simply stating "the period" can leave readers unsure of the exact time frame you intend.
Source & Trust
95%
Authority and reliability
4.8/5
Expert rating
Real-world application tested
Linguistic Context
The word "period" functions primarily as a noun, denoting a length of time, a punctuation mark, a stage in history, or menstruation. It is also used as an interjection for emphasis. As Ludwig confirms, "period" is correct and usable in English.
Frequent in
News & Media
35%
Formal & Business
30%
Science
25%
Less common in
Encyclopedias
5%
Wiki
3%
Reference
2%
Ludwig's WRAP-UP
The word "period" is a versatile term with multiple meanings, ranging from a length of time to a punctuation mark. As Ludwig confirms, it's grammatically correct and widely used. In news and business, "period" often denotes a time frame, while in scientific contexts, it can refer to specific stages or cycles. While generally neutral, the register can become more formal when discussing menstruation or historical epochs. Common errors include ambiguity in historical references, which can be avoided by providing clear context. Related terms such as "time frame" and "duration" offer alternative ways to express the concept of time.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
time frame
Replaces "period" with a focus on the boundaries within which something occurs.
time span
Similar to "period", but emphasizes the length of time something lasts.
duration
Focuses on the length of time that something continues.
interval
Highlights the space or gap between events in time.
phase
Emphasizes a distinct stage within a larger process.
stage
Similar to "phase", indicating a step in a sequence or process.
epoch
Denotes a significant period in history or someone's life.
era
Similar to "epoch", referring to a distinct time in history.
term
Indicates a specified length of time, often in an academic or professional context.
cycle
Suggests a recurring sequence of events.
FAQs
How can I use "period" in a sentence?
You can use "period" to refer to a length of time, as in "There was a "period" of adjustment after the move", or to menstruation, as in "She prefers not to swim when she's on her "period".
What are some alternative words for "period" when referring to a length of time?
Alternatives include "time frame", "time span", or "duration". The best choice depends on the specific context.
Is it acceptable to use "period" to refer to menstruation in formal writing?
While "period" is commonly understood, it might be too informal for some formal contexts. Consider using more technical terms like "menstruation" or "menses" for a more professional tone.
What's the difference between using "period" and "era"?
"Period" is a general term for a length of time, while "era" refers to a distinct "period" in history with specific characteristics. For instance, "the Victorian era" is a specific "period" in British history.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
95%
Authority and reliability
4.8/5
Expert rating
Real-world application tested