ongoing

• on-going is non-standard

From on +‎ going, related to the phrasal verb go on.

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ongoing (not comparable)

1. Continuing, permanent, lasting.
   • 2020 August 12, Andrew Mourant, “The tide is turning for a Victorian wonder”, in Rail, page 50:

     "Major refurbishments will be made over the next ten years. We have nine wooden viaducts along the line - it's an ongoing programme," he says.

2. Presently or currently happening; being in progress.

ongoing (plural ongoings)

1. Something that is going on; a happening.
   • 1961, Floyd H. Allport, Theories of perception and the concept of structure:

     We shall not be concerned here with the specific electrical or chemical changes that take place, but only with the fact of continuous ongoings as one of the elements for building a format of dynamic structure.

ongoing

1. (rare) present participle and gerund of ongo

• going on