This is the 2669th most frequent Arabic word.
المدعي
"The claimant" or "the plaintiff."
Here, 'ادعى' derived from 'المدعي' means 'to claim,' indicating the act of asserting something as true.
ادعى الرجل أنه شاهد الحادث بأم عينه.
The man claimed that he witnessed the incident with his own eyes.
In this usage, 'مدعياً' as part of the verb 'ادعى' conveys the idea of being pretentious or making unfounded claims.
لا تكن مدعياً، وتحدث فقط فيما تعرفه يقيناً.
Do not be pretentious, and speak only about what you are certain of.
In this sentence, 'المدعي' is used to refer to a person who initiates a legal case, commonly known as the plaintiff in English.