Of Persian origin; a grandee -- (most) noble, prince.
Englishman's Concordance
1) noble, nobleman Part of Speech: noun masculine A Related Word by BDB/Strong’s Number: of Persian origin Same Word by TWOT Number: 1839
Brown-Driver-Briggs
מַּרְתְּמִיםnoun masculine pluralnobles (loan-word from Old Persian fratama, first, SpiegAPK 232, compare Sanskrit prathama; LagArm. Stud. § 2289); — ׳הַמּEsther 1:3; Esther 6:9; Daniel 1:3.
Englishman's Concordance (References)
Strong's Hebrew: 6579. partemim — 3 Occurrences
Esther 1:3 HEB:פָּרַ֣ס וּמָדַ֗י הַֽפַּרְתְּמִ֛ים וְשָׂרֵ֥י הַמְּדִינ֖וֹת NAS: and Media, the nobles and the princes KJV: and Media, the nobles and princes INT: Persia and Media the nobles and the princes of his provinces
Esther 6:9 HEB:מִשָּׂרֵ֤י הַמֶּ֙לֶךְ֙ הַֽפַּרְתְּמִ֔ים וְהִלְבִּ֙ישׁוּ֙ אֶת־ NAS: of the king's most noble princes KJV: of the king's most noble princes, INT: princes of the king's noble array the man
Daniel 1:3 HEB:הַמְּלוּכָ֖ה וּמִן־ הַֽפַּרְתְּמִֽים׃ NAS: of the royal family and of the nobles, KJV: seed, and of the princes; INT: of the royal some the nobles