What is the meaning of the word "echo"?

Definitions:

a close parallel of a feeling, idea, style, and so on noun
- Their contention contains more than an echo of Rousseau.
an imitation or repetition noun
- the flower arrangement was created as an echo of a client's still life
call to mind verb
- The words etched on the monument echoed John F. Kennedy.
the repetition of a sound resulting from reflection of the sound waves noun
- They could hear echoes of their own footsteps.
to say again or imitate verb
- followers echoing the cries of their leaders