Amazement is from amaze plus -ment. The suffix -ment makes a noun of action, result, or state from amaze, matching uses in which the word names an act, process, outcome, or condition. In use as a noun, amazement denotes a feeling of great surprise and wonder. Typical contexts include “She stared at the fireworks in amazement”. The meaning stays close to the form: it applies the etymological material to a feeling of great surprise and wonder, keeping the visible parts legible in ordinary use.