Final answer:
The large oblong building used as a hall of justice and public meeting place in ancient Rome is called a Basilica.
Step-by-step explanation:
The large oblong building used as a hall of justice and public meeting place in ancient Rome is called a Basilica. The basilica served various civic and juridical purposes and was a common Roman building. It functioned as a multipurpose space for law courts, senate meetings, and business transactions.