IPA: /ˈpleɪdʒəˌrɪst/
KK: /ˈpleɪdʒəˌrɪst/
A person who copies someone else's work, ideas, or words and claims them as their own.
The teacher caught the student for being a plagiarist after he submitted an essay that was not his own.
Plagiarist → It is formed from "plagiare" (meaning to seize or take) and the suffix "-ist" (meaning a person who). A plagiarist is a person who takes someone else's work or ideas and presents them as their own.
Think of someone who 'takes' ('plagiare') the work of others and claims it as their own — that's what a plagiarist does.