in my (american academic) usage, “resume” is exactly one page and is a custom-made document to apply for a specific industry job. “CV” is “literally everything i’ve ever done since freshman year of undergrad”, and may run to 40 or more pages for senior researchers. A "biosketch" is a CV that is tabular and formatted according to semi-arcane rules laid out by funding agencies, normally the NIH.
I think of a resume as a targeted redaction of my CV.
