The word oracle comes from the Latin verb ōrāre, “to speak” and properly refers to the priest or priestess uttering the prediction. In extended use, oracle may also refer to the site of the oracle, and to the oracular utterances themselves, called khrēsmē ‘tresme’ (χρησμοί) in Greek.
Oracles were thought to be portals through which the gods spoke directly to people. In this sense they were different from seers (manteis, μάντεις) who interpreted signs sent by the gods through bird signs, animal entrails, and other various methods.
The most important oracles of Greek antiquity were Pythia (priestess to Apollo at Delphi), and the oracle of Dione and Zeus at Dodona in Epirus. Other oracles of Apollo were located at Didyma and Mallus on the coast of Anatolia, at Corinth and Bassae in the Peloponnese, and at the islands of Delos and Aegina in the Aegean Sea.
The Sibylline Oracles are a collection of oracular utterances written in Greek hexameters ascribed to the Sibyls, prophetesses who uttered divine revelations in frenzied states.
In African Settings, the Oracles are the medium of spirits eg the Late Donozio Zilabamuzale (Nabamba Budhagali 39th), Jumba Lubowa, Omusiige Sebyayi Kyabangi etc