The phrase "and once only" is correct and usable in written English.
It can be used to indicate that something occurs a single time without repetition.
Example: "The event will be held on Saturday, and once only, so make sure to attend."
Alternatives: "just once" or "one time only".
"It's not contrived, although I psych myself up because I want to do something that's once and once only.
Quite a few of those Go-Pro head camera things taking movies that will be watched by one person and once only.
I played it once, and once only, all the while trembling as the ball failed to make contact with the protective glove.
Whatever the season (real or man-made), it is sometimes increadibly hard to figure out what to wear; at the very best, any item of clothing is exactly right once, and once only.
Dying of tuberculosis in the winter of 1929-30, unable to walk, and rendered sexually impotent by his disease, he wrote these words on the last page of his last book: Man wants his physical fulfilment first and foremost, since now, once and once only, he is in the flesh and potent.
Dying of tuberculosis in the winter of 1929-30, unable to walk, and rendered sexually impotent by his disease, he wrote these words on the last page of his last book: **{:.break one} ** Man wants his physical fulfilment first and foremost, since now, once and once only, he is in the flesh and potent.
The patient drug administration screen listed all regular medication before as required and once-only orders.
We conducted a cost-effectiveness analysis of three strategies for colorectal cancer screening in Ireland: biennial gFOBT at ages 55 74, biennial FIT at ages 55 74 and once-only FSIG at age 60.
People aged 60 69 years have been offered biennial screening with faecal occult blood testing since 2006 (with slight variations in age-ranges between the England, Scotland and Wales), and once-only flexible sigmoidoscopy screening is currently being implemented at age 55 years (since 2013).
After co-culture of epithelial cells with H. pylori, supernatants were aliquoted, frozen at −80°C and thawed once only.
Now clients give permissions and personal details once only, rather every time they visit.
