IPA: //ækˈtʃueɪʃən//
KK: /ˈæktʃuˌeɪʃən/
The process of causing something to start moving or operating.
The actuation of the machine was completed successfully.
Actuation is formed from "actuare" (meaning to set in motion) and the suffix "-ion" (indicating the action or process of). The word refers to the process of setting something in motion or causing it to operate.
Think of 'setting in motion' — 'actuare' means to act or move, and '-ion' indicates the action. This helps you remember that actuation is the process of making something work or move.