Lexical Definition

‎μητρόπολις‎ mētrópolis (may-trop'-ol-is) capital ^G:N-F
from ‎μήτηρ‎ and ‎πόλις‎

chiefest city.

• a mother city, i.e. "metropolis"

Abbott-Smith

μητρό-πολις, -εως, ἡ, [in LXX for אָב etc.;]
a metropolis, chief city: ITi, subscr. (Rec.).†

Abbott-Smith References

Liddell-Scott-Jones

μητρόπολις-πολις,

Doric dialect ματρό-, poetry μητρόπολιςπτολις, [Refs 4th c.AD+]: εως, ἡ:— mother-state, as related to her colonies, of Athens in relation to the Ionians, [Refs 5th c.BC+]; of Doris in relation to the Peloponn. Dorians, [Refs 5th c.BC+]; of Meroe in relation to the Ethiopians, [Refs 5th c.BC+]; of Thera, μεγαλᾶν πολίων μ. [Refs 5th c.BC+]; of the Attic Salamis, as the μ. of the Cyprian, [Refs 4th c.BC+]; of Corinth, as the μ. of Corcyra, [Refs 5th c.BC+]; of Rome, [Refs 2nd c.AD+]

__2 metaphorically, ἐστὶ μ. τοῦ ψυχροῦ [ὁ ἐγκέφαλος] [Refs 5th c.BC+]; γεωμετρία ἀρχὴ καὶ μ. τῶν ἄλλων (i.e. μαθημάτων) [Refs 5th c.BC+]
__II one's mother-city, mothercountry, home, [Refs 5th c.BC+]
__II.2 ἁ σὰ ματρόπολις thy mother's city, [Refs 3rd c.BC+]
__III capital city, [Refs 5th c.BC+]; ἡ μ. τῆς Ἀσίας, of Ephesus, [Refs]
__III.b in Egypt, chief town of a νομός, [Refs 3rd c.BC+]