olemus
(1) otseses tähenduses:
eri materjalide vastastikune keemiline, bioloogiline vm kahjulik ülekandumine
= the unintentional transfer of material or microorganisms from one substance to another, with harmful effect
näide:
https://www.gov.mb.ca/agriculture/food-safety/at-the-food-processor/food-safety-program/pubs/fs_7.pdf

(2) ülekantult :
eri asitõendite (näiteks andmestike) elementide segunemine
= the unintentional mixing of elements of data or other evidence

https://www.computer-forensics-recruiter.com/topics/forensic_investigation_first_responses/
(the "Acquisition process" subsection)

https://www.sciencedirect.com/science/article/pii/S1875176819304263