Echo

Additional details for each of the common meanings of the word “echo”:

1. **Sound Reflection**:
– In physics, an echo is a sound wave that reflects off a surface and travels back to the listener. The time delay between the original sound and its echo can be used to calculate the distance to the reflecting surface.
– Echoes can be heard in various environments, such as canyons, mountains, empty buildings, or even in everyday situations like shouting in a quiet room.

2. **Repetition**:
– When used in a figurative sense, “echo” refers to the repetition or reiteration of something, often to emphasize its significance or to make a point more strongly.
– For example, if someone says, “His words echoed in my mind,” it means that those words kept repeating or resonating in their thoughts.

3. **Acronym**:
– ECHO, as an acronym, can refer to different organizations or concepts, depending on the context. One common example is the European Commission’s Humanitarian Aid and Civil Protection department (ECHO), which provides humanitarian assistance in crises and disasters.

If you have a specific context or usage in mind that you’d like more details about, please let me know, and I’ll provide further information accordingly.