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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
mostly at once
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "mostly at once" is correct and usable in written English.
It can be used to describe actions or events that occur simultaneously or in close succession, but not entirely at the same time. Example: "The team managed to complete the project mostly at once, with only a few tasks needing to be finished later."
✓ Grammatically correct
News & Media
Wiki
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
2 human-written examples
But the funding would need to come in significant amounts, and mostly at once, not dribbled over decades.
News & Media
But given the days of rain, and the chaos of having hundreds of workers occupying a fraction of a muddy acre mostly at once, they can't explain it completely.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
57 human-written examples
But few peasants have irrigated land, which is the main reason many Zambians will go hungry this year: the annual rains all fell at once, mostly before Christmas, leading to a poor harvest.
News & Media
Many people have gone hungry in the past few months thanks to a poor harvest: instead of falling evenly through the 2004-05 growing season, the rains came all at once, mostly early on.
News & Media
Yet I had never heard of avocado toast before coming to New York, which seemed odd, since New York avocados are mostly disgusting small, starchy, and at once underripe and bruised.
News & Media
Dens are used mostly by several females at once, and it is not uncommon to see up to 20 cubs at a single site.
Wiki
But mostly, they were in awe — at once giddy and proud.
News & Media
She's sweet on animals, and dabbles in music, but mostly she's on call 24/7, at once his accessory and his pet.
News & Media
A similar dynamic shaped the "big bang" enlargement of the Union's membership in 2004, when 10 mostly ex-Communist nations joined all at once even though they were at varying stages of economic and political evolution toward successful market democracies.
News & Media
Even so, it's an excitingly large number of mostly, probably planets to be confirmed all at once.
News & Media
Mostly, however, the Knicks have struggled to get enough of their offense together at once to survive.
News & Media
Expert writing Tips
Best practice
When using "mostly at once", ensure the context clarifies which aspects are simultaneous and which may have slight delays or variations. This will prevent misinterpretation and enhance clarity.
Common error
Avoid using "mostly at once" when events are clearly sequential or have significant time gaps. This phrase is best suited for actions that are almost, but not perfectly, simultaneous.
Source & Trust
88%
Authority and reliability
3.9/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "mostly at once" functions as an adverbial modifier, indicating the timing of an event or action. It suggests that something happens nearly, but not perfectly, simultaneously. Ludwig's examples show it qualifying how funding arrives or how tasks are completed.
Frequent in
News & Media
67%
Wiki
17%
Science
16%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "mostly at once" is used to describe events happening nearly simultaneously. According to Ludwig, it functions as an adverbial modifier that indicates timing with a degree of simultaneity but not perfection. While grammatically correct, its frequency is rare, suggesting it should be used deliberately to ensure clarity. Alternatives like "largely simultaneously" or "primarily at the same time" may offer similar meanings with potentially greater clarity. It's important to avoid overstating simultaneity. Ludwig AI confirms the acceptability of this phrase.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
mainly at once
Replaces "mostly" with "mainly", preserving the idea of a predominant simultaneity.
chiefly at once
Uses "chiefly" as a more formal substitute for "mostly", maintaining the meaning of primary simultaneity.
for the most part at once
Rephrases the original expression with emphasis on the greatest part happening at the same time
largely simultaneously
Emphasizes the degree of simultaneity, highlighting that the events occur at the same time to a great extent.
primarily at the same time
Highlights the temporal aspect, focusing on events happening at a similar time, but with room for slight variations.
almost simultaneously
Stresses the near-simultaneous nature of the events, indicating a very small time difference.
practically concurrent
Uses a more formal tone to convey events occurring at the same time or nearly so.
virtually at the same instant
Emphasizes the immediacy and near-perfect synchronicity of the occurrences.
in rapid succession
Focuses on the quick sequence of events rather than their exact simultaneity.
in close proximity
Focuses on temporal adjacency without necessarily implying complete overlap.
FAQs
How can I use "mostly at once" in a sentence?
You can use "mostly at once" to describe events that happen nearly simultaneously, like: "The project was completed "mostly at once", with only a few minor adjustments needed afterward."
What's the difference between "mostly at once" and "simultaneously"?
"Simultaneously" means events happen at the exact same time. "Mostly at once" implies they happen very close in time, but not perfectly synchronized. Use "mostly at once" when there's a slight variance.
Which is correct, "mostly at once" or "at once"?
"At once" means immediately or simultaneously. "Mostly at once" means nearly simultaneously. The correct choice depends on whether the events are perfectly synchronized or just very close in time. See also: "at once".
What can I say instead of "mostly at once"?
You can use alternatives like "largely simultaneously" or "primarily at the same time", depending on the context and the nuance you want to convey.
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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
88%
Authority and reliability
3.9/5
Expert rating
Real-world application tested