English▸ noun informal
2 short for ultramarathon:
the best way to tackle an ultra is to divide the race into manageable chunks.
▸ adverb [as submodifier] very; extremely:
the play was not just boring, it was ultra boring.
– ORIGIN early 19th century : an independent usage of ultra-, originally as an abbreviation of French ultra-royaliste ‘ultra-royalist’.