As per the title, is the proper usage “ongoing” or “on-going” when writing something such as ongoing research projects?
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Either is acceptable, though the form ongoing is almost uniquely the one used in modern times. (The hyphenated version, as with most compound words in English, was the original form; the hyphen got dropped after time as the word became more common.)as
The Online Etymology Dictionary gives the following origin:
ongoing
also on-going, 1877, from on + going (see go).