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Discover LudwigThe term "open class" is generally used in linguistics to refer to parts of speech that can expand to include words that are newly created or imported from other languages.
Yes, "open class" is a correct term that can be used in written English. You can use it in a sentence to refer to the group of English language parts of speech which can accept newly created or imported words. For example, "Unlike closed-class words, open-class words can be added to the language to create new expressions and vocabulary."
Exact(52)
"It's an open class war," he says.
Conservatives and Republicans see advantages in becoming open class warriors.
This was listed as an open class, meaning yoga students of all levels were welcome.
Coal mining is where open class warfare is often at its sharpest, most visible and violent.
Standard Class Nationals: Sam Giltner, Chester, S.C. Open Class Nationals: Sherman Griffith, Dallas, Tex.
We recommend that those who wish to attend an open class arrive Friday morning.
Similar(8)
But the trainer told him that his son looked like "an open-class fighter".
Open multi-methods generalize multiple dispatch towards open-class extensions, which improve separation of concerns and provisions for retroactive design.
Moreover, an open-class classification problem was solved using RBC scattering images with new shapes and landscape images.
The sweat went into the engineering of the most innovative design of an open-class touring machine since the Honda Gold Wing made its debut nearly four decades ago.
The Around Alone has historically accepted all qualified comers, from water-ballasted or canting keel Open-class 40-, 50- and 60-foot flat-out racers to quirky double-enders and home-built vessels.
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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