Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.“ἀρχηγέτι” Ar.Lys.644); Dor. ἀρχα_γέτας : (ἡγέομαι):—first leader, author, esp. founder of a city or family, Hdt.9.86, Pi.O.7.78, IG9(1).61.49 (Daulis); title of Apollo at Cyrene, Pi.P.5.60; at Naxos in Sicily, Th.6.3; of Heracles at Sparta, X.HG6.3.6; Asclepius in Phocis, Paus.10.32.12; Helios at Rhodes, Aristid.Or. 24(44).50; freq. of ἥρωες, IG2.1191, SIG1024.40 (Myconos), etc.; so at Athens of ἥρωες ἐπώνυμοι, Ar.Fr.126, Orac. ap. D.43.66; ὁ δήμου ἀ. the tutelary hero of the deme, Pl.Ly.205d; at Sparta of the kings, ῥήτρα ap. Plu.Lyc.6; so at Thera, IG12(3).762; fem. ἀρχηγέτις, of Athena, IG3.65, al., cf. BMus.Inscr.481*.20 (Ephesus, ii A. D.); τἀρχηγέτι, = τῇ ἀρχηγέτιδι, Ar.Lys.644.

2. generally, leader, chief, A.Supp.184,251, S.OT751, etc.; later, governor, Chor. in Rev.Phil.1.67: metaph., “ἀ. φιλοσοφίας” Jul.Or.6.188b; of a philosophical school, “τῆς ἀγωγῆς” Phld.Sto.Herc.339.12.

3. first cause, author, “τύχης” E.El.891; “γένους” Id.Or.555.