IPA: /sɪŋˈkrɪnɪkəl/
KK: /sɪŋˈkrɪnɪkəl/
Occurring at the same time or simultaneously; related to events that happen together.
The synchronical events in the two cities were celebrated with a joint festival.
Synchronical → It is formed from "synchronos" (from Greek, meaning occurring at the same time) and the suffix "-ical" (meaning pertaining to). The word "synchronical" refers to events or phenomena that occur simultaneously or at the same time.
Think of 'synchronos' meaning 'at the same time' — that's why 'synchronical' describes things happening together.