By surface analysis, process +‎ -ing.

• (UK) IPA^(key): /ˈpɹəʊsɛsɪŋ/
• (US) IPA^(key): /ˈpɹɑsɛsɪŋ/

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processing (countable and uncountable, plural processings)

1. The action of the verb to process.
   • 2013 July-August, Catherine Clabby, “Focus on Everything”, in American Scientist:

     Not long ago, it was difficult to produce photographs of tiny creatures with every part in focus. That’s because the lenses that are excellent at magnifying tiny subjects produce a narrow depth of field. A photo processing technique called focus stacking has changed that.

   • 2023 December 27, Ben Jones, “Inside Sellafield... by rail”, in RAIL, number 999, page 20:

     For 75 years, it has fulfilled a wide range of roles: producing weapons-grade plutonium for early atomic weapons in the aftermath of the Second World War; the world's first commercial nuclear power station supplying electricity to the National Grid; reprocessing and storage of nuclear fuel; and the processing of lower grades of radioactive waste for off-site storage.

2. The act of taking something through a set of prescribed procedures.
3. (computing) The act of retrieving, storing, classifying, manipulating, transmitting etc. data, especially via computer techniques.

• data processing
• parallel processing
• word processing

processing

1. present participle and gerund of process

• processing on Wikipedia.Wikipedia