| Word | Description |
| Echo Density | The amount of echoes per second produced by the reverberation algorithm. |
| Effect Chain | A series of effects that have been applied to an object or bus in a specific order. |
| Effect Instance | A customized set of effect properties that can be saved and applied to other objects or busses. Effect instance properties can also be shared across objects. |
| Empty Event | An event that doesn't contain any actions or objects. |
| Environmental Effect | An effect that alters the property set of the sounds generated by a game object depending on the position of that object in a game's geometry. |
| Event (Action Event) | A method to trigger audio in game using an action or series of actions, such as play, mute, and pause, that have been applied to one or more Wwise objects. |
| Expander | The Wwise Expander plug-in effect expands the dynamic range of a signal by weakening any part of the input signal that is below a pre-defined threshold value. When the signal is soft and below the threshold, the Expander begins to reduce the signal's gain. When the signal is at or louder than the threshold value, no gain reduction is applied to the signal. |