ἑταιρικός

From ἑταῖρος (hetaîros, “comrade, companion”) +‎ -ῐκός (-ikós, “-ic”, adjectival suffix).

ἑταιρῐκός • (hetairikós) m (feminine ἑταιρῐκή, neuter ἑταιρῐκόν); first/second declension

1. of or befitting a companion
   • 200 BCE – 118 BCE, Polybius, The Histories 16.18.7:

     αὐτὸν δὲ μετᾰ̀ τῆς ἑταιρῐκῆς ῐ̔́ππου καὶ τῶν ῠ̔πᾰσπῐστῶν κᾰτόπῐν ἐπῐστῆναι τοῖς θηρῐ́οις

     autòn dè metà tês hetairikês híppou kaì tôn hupaspistôn katópin epistênai toîs thēríois

   • 36 BCE – 30 BCE, Diodorus Siculus, Historical Library 17.37:

     Ᾰ̓λέξᾰ́νδρος δὲ μετᾰ̀ τῆς ἑταιρῐκῆς ῐ̔́ππου καὶ τῶν ᾰ̓́λλων ᾰ̓ρῐ́στων ῐ̔ππέων ἐποιεῖτο τὸν διωγμόν

     Aléxándros dè metà tês hetairikês híppou kaì tôn állōn arístōn hippéōn epoieîto tòn diōgmón

• ἑταιρῐκή (hetairikḗ, substantive)
• ἑταιρῐκόν (hetairikón, substantive)

• → Latin: hetaericē

From ἑταίρᾱ (hetaírā, “companion; courtesan”) +‎ -ῐκός (-ikós, “-ic”, adjectival suffix).

ἑταιρῐκός • (hetairikós) m (feminine ἑταιρῐκή, neuter ἑταιρῐκόν); first/second declension

1. of or like a companion, meretricious
   • 60 BCE – 7 BCE, Dionysius of Halicarnassus, Commentaries on the Attic Orators: On Lysias 3:

      […]· περῐ̀ γᾰ̀ρ δὴ τῶν ἐπῐστολῐκῶν αὐτοῦ καὶ ἑταιρῐκῶν καὶ τῶν ᾰ̓́λλων, οὓς μετᾰ̀ παιδῐᾶς ἔγρᾰψεν, οὐδὲν δέομαι λέγειν.

      […]; perì gàr dḕ tôn epistolikôn autoû kaì hetairikôn kaì tôn állōn, hoùs metà paidiâs égrapsen, oudèn déomai légein.

• ἑταιρῐκόν (hetairikón, substantive)

• “ἑταιρικός”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press