A person who works with you in the same organization or on the same project.
From prefix 'co-' (meaning together, from Latin 'cum') combined with 'worker' (from 'work' and '-er'); a modern compound for shared employment.
The prefix 'co-' created hundreds of modern words (cohost, copilot, coauthor), showing how workplaces became collaborative—the language changed as work itself changed!
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