Explosion/ɪkˈspləʊʒn/ Definition 1 of 3Pro Tip 1/3Visual Imagery An explosion can be imagined as a sudden, impactful event requiring caution. Fireworks create a beautiful explosion in the sky. Pro Tip 2/3Physical Impact Explosions often cause physical damage or change to their surroundings. The explosion demolished the building entirely. Pro Tip 3/3Noise Level Explosions are associated with very loud noises that can startle or alarm. The sound of the explosion could be heard miles away.