IPA: /ˌɔːtəˈmætɪk/
KK: /ˌɔːtəˈmætɪk/
Describing something that works by itself without needing manual control or effort.
The automatic doors opened as soon as I approached them.
A device or machine that operates on its own without needing manual control.
The factory uses an automatic to streamline production processes.
Automatic → It is formed from "auto-" (from Greek "αὐτός" meaning self) and "matic" (from Greek "ματικός" meaning relating to or having the nature of). The word "automatic" refers to something that operates by itself or without human intervention.
Think of 'self' ('auto-') doing something 'naturally' ('matic') — that's why automatic means something that works on its own.