Combustion
Definition 1 of 3
Pro Tip 1/3
Visual Imagery
Imagine the visible aspects of burning to associate with 'combustion', like flames and smoke. The campfire's combustion filled the night with orange light.
Pro Tip 2/3
Spontaneous Danger
Understand 'spontaneous combustion' can refer to unexpected, sometimes dangerous events. The warehouse suffered from spontaneous combustion due to chemical storage.
Pro Tip 3/3
Non-Literal Use
Recognize when 'combustion' is used metaphorically to express vigorous activity or emotions. The crowd's excitement reached a level of combustion when the band appeared.