ἀγοραῖοςagoraîos

relating to the market-place, i.e. forensic (times); by implication, vulgar

Greek (New Testament) · G60

Meanings

1. frequenting the ἀγορά, a lounger in the ἀγορά: Acts 17:5.

2. In late writers (Strab., and elsewhere), proper to the ἀγορά: ἀγοραῖοι (namely ἥμεραι) ἀγονται (cf. Lat. conventus agere), court-days are kept, Acts 19:38.

Same root

ἀγοράagorá · G58probably akin to G1453 (ἐγείρω)); properly, the town-square (as a place of public resort); by implication, a market or thoroughfare

Where it appears

Appears 2 times in the Bible.

Acts 17:5 But some of the Jews were jealous, so they gathered some troublemakers from the marketplace to form a mob and start a riot. They attacked the home of Jason, searching for Paul and Silas so they could drag them out to the crowd.
Acts 19:38 “If Demetrius and the craftsmen have a case against them, the courts are in session and the officials can hear the case at once. Let them make formal charges.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.