IPA: /ˌɛkspɪˈdɪʃən/
KK: /ˌɛkspəˈdɪʃən/
A journey taken by a group of people for a specific purpose, often involving exploration or research.
The team set out on an expedition to study the effects of climate change in the Arctic.
Expedition → It is formed from "ex-" (meaning out) and "pedis" (from Latin "pes", meaning foot). The word "expedition" originally referred to a journey or trip made on foot, particularly for a specific purpose or mission.
Think of going 'out' ('ex-') on a journey by 'foot' ('pedis') — that's why expedition means a journey or mission.