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Discover LudwigThe phrase "appearing only once" is correct and usable in written English.
It can be used to describe something that occurs a single time, often in contexts like literature, data analysis, or statistics.
Example: "In the dataset, the value of 42 is notable for appearing only once among the numerous entries."
Alternatives: "occurring just once" or "showing up only a single time."
Exact(17)
The commercial created such a furor -- with its tacit suggestion that Mr. Goldwater's views were so extreme that they would lead to nuclear annihilation -- that it was withdrawn after appearing only once.
The team stacked each deck with pictures shown in a previous experiment but appearing only once in the current trial.
Even though the Higgs is larger than a proton, it can be trapped and its signature is fleeting, appearing only once in a trillion collisions.
More than 60 of Newton and Cowper's hymns were republished in other British hymnals and magazines, but "Amazing Grace" was not, appearing only once in a 1780 hymnal sponsored by the Countess of Huntingdon.
Shimura mainly found her characters' names by looking through name dictionaries, although she also took the names of acquaintances and slightly changed them, and even used train station names for side characters appearing only once.
At position −8, singlet propensities describe that G is disfavored, appearing only once in the alignment.
Similar(43)
Both words appeared only once in his Aug. 21 address.
(It may appear only once; it may not be repeatable).
Bernard must have a number that appears only once.
Quantitatively, the three-note sequence appears only once in Newton's composition.
So far, he appears only once but would be thrilled to appear again.
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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