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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
then thereafter
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "then thereafter" is used in written English.
It typically means "after that," and is most often used when referring to two events that occurred in succession. For example, "John purchased a new car, then thereafter he joined a car club."
✓ Grammatically correct
Science
News & Media
Alternative expressions(20)
is equivalent to
rapidly thereafter
in the wishes of
for the immediate future
Very soon
somewhere later
one week before
at the early time
in the next weeks
during the previous years
it is important to remember
not yet completed
to avoid disruption
in accordance with direction from
a couple of books before
if not soon
as excellent as
in a flash
as instructed by the directive
as tall as
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
2 human-written examples
If they had struggled to lunch, the ball as mistimed as a Godfrey Bloom soundbite, then thereafter, as the pair adjusted and the pitch gained a fraction of pace as any moisture dried, they batted much as they pleased.
News & Media
The number of cells lining the hole walls at each time point increased significantly (P < 0.05) compared to data at 2 days, and then thereafter from nine to 16 and to 23 days.
Human-verified similar examples from authoritative sources
Similar Expressions
55 human-written examples
That gives us the best possible chance of winning the challenges which may then occur thereafter".
News & Media
"And then, shortly thereafter, the knocking on the door began," she told me.
News & Media
It seems likely that the one who stumbles then will thereafter never recover.
News & Media
And then shortly thereafter you could hear the planes overhead and you could feel the bombs thudding, thudding, thudding.
News & Media
For this reason, changes to Olympic basketball should be expected, if not in time for 2016 then shortly thereafter.
News & Media
Primus is the cheapest (just) - its landline costs £14.95 and broadband can be added for £2 for six months and then £4/month thereafter, with £15 cashback.
News & Media
And speaking of Sept. 11, Sergeant Farina spent 18-hour days then and thereafter at ground zero and at a staging area in Newark.
News & Media
Sharif's consultation then, and thereafter, was enough to help Booker overcome, but not quite vanquish, the impression that he was an Ivy League operator.
News & Media
"After a rapid rise, the number of friends peaks for people in their late teenage years, and then declines thereafter," wrote Stephen Wolfram, a scientist and entrepreneur.
News & Media
Expert writing Tips
Best practice
Consider using simpler alternatives like "after that" or "subsequently" in less formal contexts for clarity.
Common error
Avoid using "then thereafter" in everyday conversation; it may sound stilted. Opt for more natural phrases.
Source & Trust
83%
Authority and reliability
3.9/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "then thereafter" functions as an adverbial phrase indicating sequence or time. It modifies a verb or clause by specifying when an action occurred in relation to another. Ludwig highlights its use in formal contexts.
Frequent in
Science
50%
News & Media
50%
Formal & Business
0%
Less common in
Wiki
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "then thereafter" serves as an adverbial phrase used to denote a sequence of events. Although grammatically correct, Ludwig identifies it as relatively rare and more suited for formal contexts such as scientific or news writing. Simpler alternatives like "after that" or "subsequently" may be more appropriate for less formal settings. While "then thereafter" effectively conveys a chronological order, its infrequent usage can sometimes make writing sound overly formal.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
thereafter
Omits "then" for a slightly more concise expression.
after that
Simpler and more common way to express the sequence of events.
following that
More formal alternative to "after that".
subsequently
Single word replacement to convey the meaning of "afterward".
afterward
Single word replacement to convey similar meaning.
thereupon
More archaic and formal synonym for "then".
next
Brief way to describe the next action in a series.
from then on
Indicates a continuous action or state after a specific point in time.
at that point
Emphasizes a specific moment when the subsequent action occurs.
in due course
Expresses that something happened after a reasonable amount of time.
FAQs
What does "then thereafter" mean?
The phrase "then thereafter" means after that or subsequently. It's used to indicate a sequence of events.
How can I use "then thereafter" in a sentence?
Example: "The initial investment yielded positive results, "then thereafter" the company expanded its operations."
What are some alternatives to "then thereafter"?
Alternatives include "after that", "subsequently", or "afterward". Choose the one that best fits the tone of your writing.
Is it redundant to use both "then" and "thereafter"?
Yes, using both "then" and "thereafter" can be seen as slightly redundant, but it can also add emphasis to the sequence of events. While both words independently indicate that something happened afterwards, using them together creates a deliberate formal tone. Consider your audience when choosing whether to use both.
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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
83%
Authority and reliability
3.9/5
Expert rating
Real-world application tested