Definition:
Immediate fulfillment refers to the interpretation of biblical prophecy or promises that are realized within a short time frame after being spoken or written. This concept is often contrasted with prophecies that have a long-term or eschatological fulfillment. Immediate fulfillment is seen as a demonstration of God's active involvement in the world and His faithfulness to His word.

Biblical Examples:

1. Isaiah's Prophecy to Ahaz (Isaiah 7:14-16):
In the context of the Syro-Ephraimite War, the prophet Isaiah delivers a message to King Ahaz of Judah. Isaiah prophesies the birth of a child named Immanuel, stating, "Therefore the Lord Himself will give you a sign: Behold, the virgin will conceive and give birth to a son, and will call Him Immanuel" (Isaiah 7:14). While this prophecy is often associated with the birth of Jesus Christ, it also had an immediate fulfillment in the birth of a child during Ahaz's time, serving as a sign of God's presence and assurance that the threat from Syria and Israel would soon dissipate.

2. The Fall of Babylon (Isaiah 21:9):
Isaiah prophesies the fall of Babylon, declaring, "Look, here come the riders, horsemen in pairs.” And one answered, saying, “Fallen, fallen is Babylon! All the images of her gods lie shattered on the ground” (Isaiah 21:9). This prophecy was fulfilled shortly after it was given, as Babylon fell to the Medes and Persians in 539 BC, demonstrating the accuracy and immediacy of God's word through His prophet.

3. The Destruction of Jerusalem (Matthew 24:1-2):
Jesus foretells the destruction of the Jerusalem temple, saying, "Do you see all these things? He replied. Truly I tell you, not one stone here will be left on another; every one will be thrown down" (Matthew 24:2). This prophecy was fulfilled in AD 70 when the Romans destroyed Jerusalem and the temple, serving as a direct and immediate fulfillment of Jesus' words.

Theological Significance:

Immediate fulfillment serves as a testament to God's sovereignty and the reliability of His word. It reassures believers of God's control over historical events and His ability to bring about His purposes swiftly. This concept also underscores the importance of understanding the historical and cultural context of biblical prophecies, as many have both immediate and future fulfillments.

Interpretative Considerations:

When studying prophecies with immediate fulfillment, it is crucial to consider the dual nature of some prophecies, which may have both an immediate and a future aspect. This dual fulfillment is often seen in messianic prophecies, where an initial fulfillment occurs in the prophet's time, while a more complete fulfillment is realized in the life and work of Jesus Christ.

Conclusion:
Immediate fulfillment in biblical prophecy highlights the dynamic nature of God's interaction with His people and the unfolding of His divine plan throughout history. It serves as a reminder of the trustworthiness of Scripture and the certainty of God's promises.